remove cloud link from https://www.torproject.org/getinvolved/relays

Torbrowser - help - about TorBrowser links to https://www.torproject.org/getinvolved/relays

Three ways to join and help out

"Run it in the cloud." (https://www.torproject.org/getinvolved/relays#cloud) link is dead.

So that should say:

Two ways to join and help out