Thanks for this one @pierre-24, merged.

Incidentally, the material.extensions vs materialx I've been going back and forth on, as the older version of mkdocs-material is available in some Linux distributions (e.g. Ubuntu 23.10) and users may like to install it from there rather than pip. Not sure that there's a great resolution to this, except that people will slowly migrate to the newer version, and can always edit their mkdocs.yaml file for what they have installed.

Ok, I see. One way to help in this matter is to add that to the documentation :)

Whoops, I made your CI fail on exactlty that issue, sorry about that.

By the way, I think there is a way for your CI to run on PR as well and prevent PR to be merged if test fails. See there (I don't know CircleCI, but this looks like it).
Then, you "just" need to create branch protection rules and especially check the " Require status checks to pass before merging" option :)

Yes, requires some work, will get there eventually.

I've had to revert the --- change in 6afdfd3 unfortunately, turns out it breaks doxide clean. Will have to find another workaround to avoid the <hr>.

Fixed in 7d308b1. MkDocs seems to want the frontmatter to both start and end with --- to not insert the <hr>. A few updates were required to Doxide's parsing of YAML frontmatter accordingly.