after some cleanup, we just put the `mwlib.pdf` MediaWiki to PDF renderer on our Github account: https://github.com/pediapress/mwlib.pdf
Unfortunately, the renderer still requires Python 2.7 because it depends on mwlib. Once mwlib has been upgraded to Python 3, it won't be difficult to upgrade the renderer as well. But as you will see, the renderer still requires substantial work.
It's been a very long time since PediaPress released a new renderer so it's very possible that some elements might not work. Please file a bug or share your feedback here if you run into problems.