Update "About Tor Browser" links in Tor Browser

In Tor Browser, in Help > About Tor Browser, we should update some links:

  1. Donate to https://donate.torproject.org
  2. Get involved to https://community.torproject.org
  3. Questions to https://support.torproject.org
  4. Help the Tor Network Grow! to https://community.torproject.org/relay
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