Follow instructions at https://www.sphinx-doc.org/en/master/usage/markdown.html.
This switches from `recommonmark` (deprecated) to `myst-parser`
(recommended).
Only impacts the changelog page, which was broken after recent upgrades
to Sphinx for Python 3.10 compatibility.
Signed-off-by: Milas Bowman <milas.bowman@docker.com>
* Upgrade to latest Sphinx / recommonmark
* Small CSS fix for issue in new version of Alabaster theme
* Fix `Makefile` target for macOS
Signed-off-by: Milas Bowman <milas.bowman@docker.com>