fix(git-extra): use cs.fcuny.xyz for my own repositories

I run an instance of sourcegraph on cs.fcuny.xyz for some of my
repositories. When using `git-link' on my own code, I want to go there.

I refactor some of the code to format the base URL using the hostname,
and clean up the directory name in case the repository is coming from a
gerrit server (there's a `a/' prefix to the name of the repository that
I need to drop).

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