Git doc: add a Troubleshooting section with per-remote contact info.
I'm told that email@example.com gets support request from Tails contributors about repositories they don't host, and I know for a fact that Tails sysadmins also experience this issue. It's a waste of time for sysadmins who have to redirect support requests to the right place pretty often. And more importantly, it's frustrating for Tails contributors, as it adds round-trips, delays, and contributes to "nobody feels responsible / wants to help me" feelings.
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