Add test coverage to the important features of
[`routers.web.repo.renderReadmeFile`](34f32b262b/routers/web/repo/view.go (L273));
namely that:
- it can handle looking in docs/, .gitea/, and .github/
- it can handle choosing between multiple competing READMEs
- it prefers the localized README to the markdown README to the
plaintext README
- it can handle broken symlinks when processing all the options
- it uses the name of the symlink, not the name of the target of the
symlink
68d0c5d1d1