Add visual cues to which repos are tracked by a project

This now shows a badge next to each organisation as to how many are tracked in the project, plus it replaces the "Import" link & icon with an indication whether a project is tracked or not.

In order to test you will need to add repos to projects via the admin for now.
Comment here saying that we are gathering the stats of how many repos in a project, and which repos are tracked for display purposes may be helpful in future..