Support relative links from a wiki page to files in the repository
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=15602) </details> <!--IssueSummary end--> - Related to https://gitlab.com/gitlab-org/gitlab-foss/-/issues/3275 # Problem - There's no way to create a relative link from a wiki page to a file in the same repository - Previously, links of the form `[README.md](../blob/master/README.md)` from the wiki worked as expected - This was a side effect of a lax implementation and was incidentally removed in https://gitlab.com/gitlab-org/gitlab-foss/-/issues/18019 / https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/4432 # Proposal - Allow linking to repository files from a wiki page using syntax like `[README.md](../blob/master/README.md)`
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