Feat: use a CI template for Onion MkDocs (tpo/web/onion-mkdocs#10)

Testing tpo/web/onion-mkdocs#10 (closed).

added Documentation label

requested review from @rhatto

assigned to @rhatto

added 3 commits

• 52d13940...fcf29f9b - 2 commits from branch main
• c6c8fe4f - Merge branch 'main' of gitlab.torproject.org:tpo/onion-services/onionplan into feat/ci-templates

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approved this merge request

merged

mentioned in commit 67a871ec