@duncan cheers, I've merged the posts. Apologies for not keeping it in the right discussion.
As people seem to think it's a step in the right direction, I've now copied it over to the main homepage. Feel free to continue hacking on it! I like the three words "Learn | Create | Contribute", I think they make sense. Please go for it!
I have also upgraded Mediawiki to 1.35.0, which is the latest version. No doubt there will be some subtle improvements. One big improvement is that the page editor now contains buttons to help create the correct markup.
1.35.0 also comes with a much nicer visual rich editor (@stephen_l) but unfortunately there seems to be a bug where it works for new pages, but breaks in a funky way if you want to edit an existing page created prior to v1.35.0 (@Cyril and I spent some time trying to track the bug down!). Other users are experiencing the same bug, so we'll just wait for it to be fixed before rolling it out.
@ReD_CoDE that repo is for Github docs itself, not for users to create their own documentation, I think.