refactor(wiki.nixos.org): use mediawiki library module

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Integrates the new library module for MediaWiki sites from #1866. Must be merged after #1866 is merged into main.

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@orangci I'd love if you could take a quick look and see if anything is broken. If things look good for the most part I'm going to merge #1866 before rebasing this one and merging it. Just don't merge it yourself yet :)

[orangci]

Tested using https://raw.githubusercontent.com/catppuccin/userstyles/b9a7bb8e6ad1d8c11f174afbe4e8394f60bd0eb3/lib/mediawiki.less as the import instead of using https://userstyles.catppuccin.com/lib/mediawiki.less, as that doesn't exist (yet).

Works excellently! Great work on #1866.

I did notice that table cells don't seem to have proper borders.
For an example of this visit https://wiki.nixos.org/wiki/Terms_and_Definitions_in_Nix_Project and try toggling the userstyle off and on.

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Tested using b9a7bb8/lib/mediawiki.less (raw) as the import instead of using userstyles.catppuccin.com/lib/mediawiki.less, as that doesn't exist (yet).

Oops yeah sorry I forgot to mention that, you figured it out anyway ahah.

I did notice that table cells don't seem to have proper borders.
For an example of this visit wiki.nixos.org/wiki/Terms_and_Definitions_in_Nix_Project and try toggling the userstyle off and on.

Thanks. I've adjusted border colors more and I think it's better: a6eda7e (#1866).

[orangci]

Thanks. I've adjusted border colors more and I think it's better: a6eda7e (#1866).

Yep, this is definitely better. I think this PR is now ready to merge as soon as #1866 is merged. 🧡