CI: don't trigger unittests for docs

[black-sliver]

What is this fixing or adding?

See title. Also any .md (like README.md and worlds/_bizhawk/README.md) now.

How was this tested?

CI.

[PoryGone]

Notably, this does not capture the original use case that I brought up in the dev channel, that being README.md and CHANGELOG.md files in the root of world folders.

[black-sliver]

Updated. Note that the original rule is still useful because it matches *.png and *.jpg in world docs.

[Berserker66]

Until one day we might have doctests, but for now this should be fine.

[black-sliver]

Hm, I mean there is this, that I didn't think about: https://github.com/ArchipelagoMW/Archipelago/blob/main/test/webhost/test_docs.py

[black-sliver]

I changed it to draft because it breaks the unit test that checks if a world has docs (for webhost).