Squashed 'docs/' changes from acf70cdd9..0f2bf195e

0f2bf195e Adjust shortcodes for 0.55
48c577121 Fix deprecation warnings
ed95a341a Update index.md
e4bc8981f Release 0.55.0
25acacb91 Merge branch 'temp55'
b240e321a releaser: Add release notes to /docs for release of 0.55.0
86a190c92 docs: Add information about summary front matter variable
9d94f4340 integrity: Add support for sha384
dd3fe9f92 Add HUGO_NUMWORKERMULTIPLIER
968372d86 Add trace.out to .gitignore
660772713 Add the Fireship images to cache
41a3e19cb hugolib: Allow page-relative aliases
4497e4b12 Update faq.md
b0ee3dccc output: Add missing JSON tag
173dac0b7 docs: Regenerate docshelper data
e30473062 docs: Regenerate CLI docs
8cb775be2 Merge commit 'c2037f0c9a3a35b9db9c404f6b5f94ec8b690a53'
5bc64bf44 Make Page an interface
371ff6c12 Add skipHTML option to blackfriday config

git-subtree-dir: docs
git-subtree-split: 0f2bf195ef549013cc843199fb50317b0d1a5e85

.gitignore

@@ -2,3 +2,4 @@
 /public
 nohup.out
 .DS_Store
+trace.out