create sitemap.xml

- install https://github.com/jdillard/sphinx-sitemap
- see MDAnalysis/MDAnalysis.github.io#78

.travis.yml

@@ -15,7 +15,7 @@ install:
   - pip install --upgrade pytest
   - pip install codecov pytest-cov pytest-pep8
   - pip install --upgrade numpy cython
-  - if [[ $TRAVIS_PYTHON_VERSION == "3.6" ]]; then pip install --upgrade sphinx; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == "3.6" ]]; then pip install --upgrade sphinx sphinx-sitemap; fi
   - pip install -e .
 
 script:

docs/conf.py

@@ -30,7 +30,10 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.napoleon']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.napoleon', 'sphinx_sitemap']
+
+# for sitemap with https://github.com/jdillard/sphinx-sitemap
+site_url = "https://www.mdanalysis.org/pytng/"
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']