Let's not advertise help desk emails directly

Tor Browser 3.5 now advertises support help desk emails more prominently. While showing our users how to get help is a great idea, giving them an help desk address directly puts a severe load on the support assistants that could partially be avoided.

I think we should rather point them to a web page with the following:

List of Tor Browser known issues.
Frequently Asked Questions related to Tor Browser
Frequently Asked Questions related to Tor
The help desk emails

That list can be refined over time.

The ticket should probably be split in multiple things, as it concerns Tor Browser release management (for the list of known issues) and the website.

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