feat(ops/nixos/camden): Set up cgit service r/545

Adds a user & group which are configured to own the local depot copy,
and a cgit service to serve it.

The depot checkout was configured as:

  mkdir -p /var/git && chown git: /var/git

  # now, as the git user, in /var/git
  git clone --bare ... depot
  chmod -R g+rw /var/git
  chmod g+s (find /var/git -type d)
  git init --bare --shared=all depot

My personal user is a member of the git group, which means that after
the above configuration I can push to the bare repo as my user and
things work.

Also, crucially, the `post-update` hook must be enabled as cgit uses
the dumb HTTP transport.

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