diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 000000000000..bf7caeaa1d8c
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,13 @@
+version: 2
+
+build:
+  os: "ubuntu-20.04"
+  tools:
+    python: "3.8"
+
+sphinx:
+   configuration: doc/source/conf.py
+
+python:
+   install:
+   - requirements: doc/requirements-doc.txt
\ No newline at end of file
diff --git a/doc/Makefile b/doc/Makefile
index 476f774bb235..cfbb7aea0911 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -1,5 +1,4 @@
 # Makefile for Sphinx documentation
-#
 
 # You can set these variables from the command line.
 SPHINXOPTS    =
@@ -19,31 +18,13 @@ ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) sou
 # the i18n builder cannot share the environment and doctrees with the others
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest coverage gettext
+.PHONY: help clean html develop linkcheck doctest coverage
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"
-	@echo "  html       to make standalone HTML files"
-	@echo "  dirhtml    to make HTML files named index.html in directories"
-	@echo "  singlehtml to make a single large HTML file"
-	@echo "  pickle     to make pickle files"
-	@echo "  json       to make JSON files"
-	@echo "  htmlhelp   to make HTML files and a HTML help project"
-	@echo "  qthelp     to make HTML files and a qthelp project"
-	@echo "  applehelp  to make an Apple Help Book"
-	@echo "  devhelp    to make HTML files and a Devhelp project"
-	@echo "  epub       to make an epub"
-	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
-	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
-	@echo "  latexpdfja to make LaTeX files and run them through platex/dvipdfmx"
-	@echo "  text       to make text files"
-	@echo "  man        to make manual pages"
-	@echo "  texinfo    to make Texinfo files"
-	@echo "  info       to make Texinfo files and run them through makeinfo"
-	@echo "  gettext    to make PO message catalogs"
-	@echo "  changes    to make an overview of all changed/added/deprecated items"
-	@echo "  xml        to make Docutils-native XML files"
-	@echo "  pseudoxml  to make pseudoxml-XML files for display purposes"
+	@echo "  clean      to remove all build files"
+	@echo "  html       to build the documentation as HTML, as in production"
+	@echo "  develop    to build the documentation as HTML, for quick development"
 	@echo "  linkcheck  to check all external links for integrity"
 	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
 	@echo "  coverage   to run coverage check of the documentation (if enabled)"
@@ -68,110 +49,12 @@ develop:
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
 	@echo "View the documentation by opening a browser and going to $(BUILDDIR)/html/index.html."
 
-dirhtml:
-	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
-	@echo
-	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
-
-singlehtml:
-	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
-	@echo
-	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
-
-pickle:
-	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
-	@echo
-	@echo "Build finished; now you can process the pickle files."
-
-json:
-	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
-	@echo
-	@echo "Build finished; now you can process the JSON files."
-
-htmlhelp:
-	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
-	@echo
-	@echo "Build finished; now you can run HTML Help Workshop with the" \
-	      ".hhp project file in $(BUILDDIR)/htmlhelp."
-
-qthelp:
-	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
-	@echo
-	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
-	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
-	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/Ray.qhcp"
-	@echo "To view the help file:"
-	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/Ray.qhc"
-
-applehelp:
-	$(SPHINXBUILD) -b applehelp $(ALLSPHINXOPTS) $(BUILDDIR)/applehelp
-	@echo
-	@echo "Build finished. The help book is in $(BUILDDIR)/applehelp."
-	@echo "N.B. You won't be able to view it unless you put it in" \
-	      "~/Library/Documentation/Help or install it in your application" \
-	      "bundle."
-
-devhelp:
-	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
-	@echo
-	@echo "Build finished."
-	@echo "To view the help file:"
-	@echo "# mkdir -p $$HOME/.local/share/devhelp/Ray"
-	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/Ray"
-	@echo "# devhelp"
-
-epub:
-	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
-	@echo
-	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
-
-latex:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
-	@echo
-	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
-	@echo "Run \`make' in that directory to run these through (pdf)latex" \
-	      "(use \`make latexpdf' here to do that automatically)."
-
-latexpdf:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
-	@echo "Running LaTeX files through pdflatex..."
-	$(MAKE) -C $(BUILDDIR)/latex all-pdf
-	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
-
-latexpdfja:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
-	@echo "Running LaTeX files through platex and dvipdfmx..."
-	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
-	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
-
-text:
-	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
-	@echo
-	@echo "Build finished. The text files are in $(BUILDDIR)/text."
-
-man:
-	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
-	@echo
-	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
-
-texinfo:
-	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
-	@echo
-	@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
-	@echo "Run \`make' in that directory to run these through makeinfo" \
-	      "(use \`make info' here to do that automatically)."
-
 info:
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
 	@echo "Running Texinfo files through makeinfo..."
 	make -C $(BUILDDIR)/texinfo info
 	@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
 
-gettext:
-	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
-	@echo
-	@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
-
 changes:
 	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
 	@echo
@@ -192,13 +75,3 @@ coverage:
 	$(SPHINXBUILD) -b coverage $(ALLSPHINXOPTS) $(BUILDDIR)/coverage
 	@echo "Testing of coverage in the sources finished, look at the " \
 	      "results in $(BUILDDIR)/coverage/python.txt."
-
-xml:
-	$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
-	@echo
-	@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
-
-pseudoxml:
-	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
-	@echo
-	@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."
diff --git a/doc/README.md b/doc/README.md
index f707e059c63e..6b79ea2f22ca 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -25,19 +25,6 @@ make develop && open _build/html/index.html
 > expensive parts of the build process. In particular, it will aggressively prune the
 > left-hand side navigation, but leave the documents itself intact.
 
-## Building just one subproject
-
-Often your changes in documentation just concern one subproject, such as Tune or Train.
-To build just this one subproject, and ignore the rest
-(leading to build warnings due to broken references etc.), run the following command:
-
-```shell
-DOC_LIB=<project> sphinx-build -b html -d _build/doctrees  source _build/html
-```
-where `<project>` is the name of the subproject and can be any of the docs projects in the `source/`
-directory either called `tune`, `rllib`, `train`, `cluster`, `serve`, `data` or the ones starting
-with `ray-`, e.g. `ray-observability`.
-
 ## Announcements and includes
 
 To add new announcements and other messaging to the top or bottom of a documentation page,
diff --git a/doc/make.bat b/doc/make.bat
deleted file mode 100644
index 8f863202ed2b..000000000000
--- a/doc/make.bat
+++ /dev/null
@@ -1,263 +0,0 @@
-@ECHO OFF
-
-REM Command file for Sphinx documentation
-
-if "%SPHINXBUILD%" == "" (
-	set SPHINXBUILD=sphinx-build
-)
-set BUILDDIR=_build
-set ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% .
-set I18NSPHINXOPTS=%SPHINXOPTS% .
-if NOT "%PAPER%" == "" (
-	set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
-	set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
-)
-
-if "%1" == "" goto help
-
-if "%1" == "help" (
-	:help
-	echo.Please use `make ^<target^>` where ^<target^> is one of
-	echo.  html       to make standalone HTML files
-	echo.  dirhtml    to make HTML files named index.html in directories
-	echo.  singlehtml to make a single large HTML file
-	echo.  pickle     to make pickle files
-	echo.  json       to make JSON files
-	echo.  htmlhelp   to make HTML files and a HTML help project
-	echo.  qthelp     to make HTML files and a qthelp project
-	echo.  devhelp    to make HTML files and a Devhelp project
-	echo.  epub       to make an epub
-	echo.  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter
-	echo.  text       to make text files
-	echo.  man        to make manual pages
-	echo.  texinfo    to make Texinfo files
-	echo.  gettext    to make PO message catalogs
-	echo.  changes    to make an overview over all changed/added/deprecated items
-	echo.  xml        to make Docutils-native XML files
-	echo.  pseudoxml  to make pseudoxml-XML files for display purposes
-	echo.  linkcheck  to check all external links for integrity
-	echo.  doctest    to run all doctests embedded in the documentation if enabled
-	echo.  coverage   to run coverage check of the documentation if enabled
-	goto end
-)
-
-if "%1" == "clean" (
-	for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
-	del /q /s %BUILDDIR%\*
-	goto end
-)
-
-
-REM Check if sphinx-build is available and fallback to Python version if any
-%SPHINXBUILD% 2> nul
-if errorlevel 9009 goto sphinx_python
-goto sphinx_ok
-
-:sphinx_python
-
-set SPHINXBUILD=python -m sphinx.__init__
-%SPHINXBUILD% 2> nul
-if errorlevel 9009 (
-	echo.
-	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
-	echo.installed, then set the SPHINXBUILD environment variable to point
-	echo.to the full path of the 'sphinx-build' executable. Alternatively you
-	echo.may add the Sphinx directory to PATH.
-	echo.
-	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
-	exit /b 1
-)
-
-:sphinx_ok
-
-
-if "%1" == "html" (
-	%SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/html.
-	goto end
-)
-
-if "%1" == "dirhtml" (
-	%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
-	goto end
-)
-
-if "%1" == "singlehtml" (
-	%SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
-	goto end
-)
-
-if "%1" == "pickle" (
-	%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can process the pickle files.
-	goto end
-)
-
-if "%1" == "json" (
-	%SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can process the JSON files.
-	goto end
-)
-
-if "%1" == "htmlhelp" (
-	%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can run HTML Help Workshop with the ^
-.hhp project file in %BUILDDIR%/htmlhelp.
-	goto end
-)
-
-if "%1" == "qthelp" (
-	%SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can run "qcollectiongenerator" with the ^
-.qhcp project file in %BUILDDIR%/qthelp, like this:
-	echo.^> qcollectiongenerator %BUILDDIR%\qthelp\Ray.qhcp
-	echo.To view the help file:
-	echo.^> assistant -collectionFile %BUILDDIR%\qthelp\Ray.ghc
-	goto end
-)
-
-if "%1" == "devhelp" (
-	%SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished.
-	goto end
-)
-
-if "%1" == "epub" (
-	%SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The epub file is in %BUILDDIR%/epub.
-	goto end
-)
-
-if "%1" == "latex" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
-	goto end
-)
-
-if "%1" == "latexpdf" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	cd %BUILDDIR%/latex
-	make all-pdf
-	cd %~dp0
-	echo.
-	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
-	goto end
-)
-
-if "%1" == "latexpdfja" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	cd %BUILDDIR%/latex
-	make all-pdf-ja
-	cd %~dp0
-	echo.
-	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
-	goto end
-)
-
-if "%1" == "text" (
-	%SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The text files are in %BUILDDIR%/text.
-	goto end
-)
-
-if "%1" == "man" (
-	%SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The manual pages are in %BUILDDIR%/man.
-	goto end
-)
-
-if "%1" == "texinfo" (
-	%SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
-	goto end
-)
-
-if "%1" == "gettext" (
-	%SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
-	goto end
-)
-
-if "%1" == "changes" (
-	%SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.The overview file is in %BUILDDIR%/changes.
-	goto end
-)
-
-if "%1" == "linkcheck" (
-	%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Link check complete; look for any errors in the above output ^
-or in %BUILDDIR%/linkcheck/output.txt.
-	goto end
-)
-
-if "%1" == "doctest" (
-	%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Testing of doctests in the sources finished, look at the ^
-results in %BUILDDIR%/doctest/output.txt.
-	goto end
-)
-
-if "%1" == "coverage" (
-	%SPHINXBUILD% -b coverage %ALLSPHINXOPTS% %BUILDDIR%/coverage
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Testing of coverage in the sources finished, look at the ^
-results in %BUILDDIR%/coverage/python.txt.
-	goto end
-)
-
-if "%1" == "xml" (
-	%SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The XML files are in %BUILDDIR%/xml.
-	goto end
-)
-
-if "%1" == "pseudoxml" (
-	%SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
-	goto end
-)
-
-:end
diff --git a/doc/requirements-doc.txt b/doc/requirements-doc.txt
index d9c3a7efdcf6..a8ba3c24e3f4 100644
--- a/doc/requirements-doc.txt
+++ b/doc/requirements-doc.txt
@@ -18,7 +18,6 @@ mock
 numpy
 scikit-image
 pandas
-pickle5
 pillow
 pyarrow
 pydantic < 1.10.0
@@ -49,14 +48,16 @@ git+https://github.com/ray-project/ray_lightning@main#ray_lightning
 Pygments==2.13.0
 
 # Sphinx
-sphinx==4.3.2
+# TODO: https://github.com/executablebooks/sphinx-external-toc/issues/90
+#     needs to be fixed to upgrade to sphinx >= 6.0.0
+sphinx==5.3.0  # upgrade to 6.2.1 later, and ultimately 7.x
 sphinx-click==3.0.2
 sphinx-copybutton==0.4.0
 sphinxemoji==0.2.0
 sphinx-jsonschema==1.17.2
 sphinx-version-warning==1.1.2
-sphinx-book-theme==0.3.3
-sphinx-external-toc==0.2.4
+sphinx-book-theme==1.0.1
+sphinx-external-toc==0.3.1
 sphinx-sitemap==2.2.0
 sphinxcontrib-redoc==1.6.0
 sphinx-tabs==3.4.0
@@ -65,11 +66,11 @@ autodoc_pydantic==1.6.1
 sphinx_design==0.4.1
 
 # MyST
-myst-parser==0.15.2
-myst-nb==0.13.1
+myst-parser==0.18.0  # migrate to 1.0.0 once myst-nb is updated and allows it
+myst-nb==0.17.2
 
 # Jupyter conversion
 jupytext==1.13.6
 
 # Pin urllib to avoid downstream ssl incompatibility issues
-urllib3 < 1.27
\ No newline at end of file
+urllib3 < 1.27
diff --git a/doc/source/conf.py b/doc/source/conf.py
index df2f77ffe23e..7a573a5ed05b 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -59,6 +59,7 @@
     "sphinx_design",
 ]
 
+
 # Prune deep toc-trees on demand for smaller html and faster builds.
 # This only effects the navigation bar, not the content.
 if os.getenv("FAST", False):
@@ -139,17 +140,16 @@
 
 FORUM_LINK = "https://discuss.ray.io"
 versionwarning_messages = {
-    # Re-enable this after Ray Summit.
-    # "latest": (
-    #     "This document is for the latest pip release. "
-    #     'Visit the <a href="/en/master/">master branch documentation here</a>.'
-    # ),
-    # "master": (
-    #     "<b>Got questions?</b> Join "
-    #     f'<a href="{FORUM_LINK}">the Ray Community forum</a> '
-    #     "for Q&A on all things Ray, as well as to share and learn use cases "
-    #     "and best practices with the Ray community."
-    # ),
+    "latest": (
+        "This document is for the latest pip release. "
+        'Visit the <a href="/en/master/">master branch documentation here</a>.'
+    ),
+    "master": (
+        "<b>Got questions?</b> Join "
+        f'<a href="{FORUM_LINK}">the Ray Community forum</a> '
+        "for Q&A on all things Ray, as well as to share and learn use cases "
+        "and best practices with the Ray community."
+    ),
 }
 
 versionwarning_body_selector = "#main-content"
@@ -157,9 +157,6 @@
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]
 
-# The encoding of source files.
-# source_encoding = 'utf-8-sig'
-
 # The master toctree document.
 master_doc = "index"
 
@@ -173,11 +170,8 @@
 # built documents.
 from ray import __version__ as version
 
-# The full version, including alpha/beta/rc tags.
 release = version
 
-language = None
-
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # Also helps resolve warnings about documents not included in any toctree.
@@ -199,28 +193,9 @@
     "ray-core/runtime_env_auth.md",
 ]
 
-# If "DOC_LIB" is found, only build that top-level navigation item.
-build_one_lib = os.getenv("DOC_LIB")
-
-all_toc_libs = [f.path for f in os.scandir(".") if f.is_dir() and "ray-" in f.path]
-all_toc_libs += [
-    "cluster",
-    "tune",
-    "data",
-    "train",
-    "rllib",
-    "serve",
-    "workflows",
-]
-if build_one_lib and build_one_lib in all_toc_libs:
-    all_toc_libs.remove(build_one_lib)
-    exclude_patterns += all_toc_libs
-
-
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = "lovelace"
 
-
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
 
@@ -283,57 +258,15 @@
 # "<project> v<release> documentation".
 html_title = f"Ray {release}"
 
-# A shorter title for the navigation bar.  Default is the same as html_title.
-# html_short_title = None
+language = 'en'
 
-# The name of an image file (within the static path) to use as favicon of the
-# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
-# pixels large.
 html_favicon = "_static/favicon.ico"
 
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ["_static"]
 
-
 # Output file base name for HTML help builder.
 htmlhelp_basename = "Raydoc"
 
-# -- Options for LaTeX output ---------------------------------------------
-
-latex_elements = {
-    # The paper size ('letterpaper' or 'a4paper').
-    # 'papersize': 'letterpaper',
-    # The font size ('10pt', '11pt' or '12pt').
-    # 'pointsize': '10pt',
-    # Additional stuff for the LaTeX preamble.
-    # 'preamble': '',
-    # Latex figure (float) alignment
-    # 'figure_align': 'htbp',
-}
-
-latex_documents = [
-    (master_doc, "Ray.tex", "Ray Documentation", author, "manual"),
-]
-
-# -- Options for manual page output ---------------------------------------
-
-man_pages = [(master_doc, "ray", "Ray Documentation", [author], 1)]
-
-# -- Options for Texinfo output -------------------------------------------
-texinfo_documents = [
-    (
-        master_doc,
-        "Ray",
-        "Ray Documentation",
-        author,
-        "Ray",
-        "Ray provides a simple, universal API for building distributed applications.",
-        "Miscellaneous",
-    ),
-]
-
 # Python methods should be presented in source code order
 autodoc_member_order = "bysource"