Peertube: Add a way to contact instance admin

[gegeweb]

If not specified in the about, terms or description, there is no way to contact the administrator of an instance.

Why not a contact form to not expose the email address?

[kyrahabattoir]

Shouldn't it be up to the instance admin if they wish to be contacted?

[ChameleonScales]

Being an admin is a responsibility. There should be some form of contact in order to address issues like bugs, abuse, software upgrades and federation requests.
If an admin doesn't want to be contacted, maybe he shouldn't be hosting an instance for others to use.

[Chocobozzz]

Implemented in https://github.com/Chocobozzz/PeerTube/commit/a4101923e699e49ceb9ff36e971c75417fafc9f0 & https://github.com/Chocobozzz/PeerTube/commit/3866f1a02f73665541468fbadcc3cd2cc459aef2 & https://github.com/Chocobozzz/PeerTube/commit/d3e56c0c4b307c99e83fbafb7f2c5884cbc20055

(opt-out)