add instructions to refresh TB pgp key

championquizzerrequested to merge
(removed):instructions-to-refresh-pgp-keys into main

closes #278 (closed)

  1. Adding instructions to refresh the Tor Browser Developers key in order to fetch new subkeys
  2. Noted from #290 (closed), I am removing the subkey fingerprint from the example as it can be confusing for users.

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