With older versions of the RTD theme, paragraphs in nested lists would
lead to inconsistent spacing. This has been fixed, so we can remove our
workaround to use line blocks instead of paragraphs.

2 spaces is the most common indentation width used in the docs; adjust
the rest for consistency.

Also change .editorconfig accordingly.

None of the other release pages have a "v" before the version number.

(cherry picked from commit 4bfcd6ae)

(cherry picked from commit 1566324f)

(cherry picked from commit f1f188f8)

(cherry picked from commit c612dfba)