Squashed 'docs/' changes from 60a58d123..327003421

Squashed 'docs/' changes from 60a58d123..327003421

327003421 Update index.md
cafdccc13 Hugo 0.86.1
467a89a02 Merge branch 'v0861'
a22c37bc9 Merge branch 'release-0.86.1'
276da91a8 releaser: Add release notes to /docs for release of 0.86.1
198cdf8f0 tpl/lang: Add new localized versions of lang.FormatNumber etc.
93f986ecc Add timezone support for front matter dates without one
b30b876bb Localize time.Format
950fdab90 Fix AddDate documentation
78d7b52b6 Document config.cascade
fd1e1e4b7 Fix grammar and spelling (#1497)
05bf3aa32 Fix grammar / typos in news
32060a3b4 One more try
f6e24ddfa PNG to JPG for the rel notes image
9ec5bdfad Update index.md
5f5d7f69d Release Hugo 0.86.0
2dd60bb71 releaser: Add release notes to /docs for release of 0.86.0
6445fb36c Merge commit '53a352795a69a9d4a373f50ec62138595948c6ea'
cb57ca73a Simplify "active menu" logic for section menus

git-subtree-dir: docs
git-subtree-split: 327003421d8c07f9764aaaf644626805287fd30c