[Relay Operations][Getting Help] Add hyperlinks to IRC channel (OFTC webchat) and mailing-list archive

1. In this sentence- You can also get help by joining the IRC channel #tor-relays on the 'Getting Help' page, we must redirect the user to #tor-relays IRC channel on OFTC webchat i.e. https://webchat.oftc.net/?channels=tor-relays (to maintain consistency throughout our docs).
2. In this sentence- Make sure to check out the archives!, we must hyper link the archives to the tor-relays mailing-list archives here: https://lists.torproject.org/pipermail/tor-relays/