If a repository administrator is viewing a repository, and there are
units that can be enabled, display an "Add more..." link that leads to
the repository unit settings page.
The goal here is to allow instances to configure a small set of repo
units to be enabled by default, but also highlight for repo admins that
they can add more.
Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>
e07b0e75ff