Indicate on the overview page whether the repo is git or hg

Repos can be either git or hg, but the only indication regular users have that a given repo is one or the other is the SSH URL on the overview page. Since the git and hg commands are not interchangeable, there are a lot of users who try to git clone an hg repo; that fails with a 404 status on HTTPS or "not a git repository" on SSH.

Please add an icon to the overview page or somewhere that shows whether a given repository uses git or hg.