this series tries to
1. render options with role. so the options can be cross referenced and defined.
2. move the formatting out of the content. so the representation can be defined in a more flexible way.
Closesscylladb/scylladb#15860
* github.com:scylladb/scylladb:
docs: add divider using CSS
docs: extract _clean_description as a filter
docs: render option with role
docs: parse source files right into rst
60ea940f9e