If you're on tree/foo/bar, the about link will now point to
about/foo/bar.
Currently the annoying thing about this is that it will also do it for
files.
This means that individual subtrees of a repository will also have
their READMEs rendered on the about page, for example:
/foo/bar/README.md
Will render on:
/about/foo/bar/
This is useful for monorepo setups in which subtrees represent
individual projects.
Generates URLs that do not include the repository name.
On git.tazj.in, only one repository (depot) is served - hence URLs
generated by cgit need not include the name.
