Don't point to the Tor support channels in Tor Launcher

For the moment, the initial screen of Tor Launcher appears when choosing to configure proxy, firewall, or bridges from Tails Greeter. This includes the sentence “For assistance, contact help@rt.torproject.org”.

The Tor help desk can foresee this causing problems for them, and ask us remove it.

Related issues

Related to #6893 (closed)
Related to #16293 (closed)

Original created by @sajolida on 6898 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information