If we have a domain configured eg giteapages.io then besides the normal
user.giteapages.io and org.giteapages.io we also support
repo.user.giteapages.io / repo.org.giteapages.io
branch.repo.user.giteapages.io / branch.repo.org.giteapages.io
If we don't find a repo, we search for the gitea-pages repo if this
exists, has the gitea-pages topic tag and has a gitea-pages branch we
will use this to do a file lookup.
We don't need a gitea-pages.toml config file for this repo.
