docs: Add initial support for using gi-docgen for docs

The files here are copied from the docs-gtk-org
branch of gtk.

This adds gi-docgen to the CI Dockerfiles and ensures the new versions
(including the OS upgrades from the previous commit) are used during CI.

Helps: #3037
This commit is contained in:
Matthias Clasen
2023-10-09 23:04:21 +01:00
committed by Philip Withnall
parent 9dd59ba8ad
commit 39e9ef54be
21 changed files with 251881 additions and 6 deletions

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