consolidate relay setup instruction pages and link to new guide

We now have the Tor Relay Guide, lets remove old content from the website and link to the new content (trac page). This is just a stop gap step before the new community portal becomes reality.

Delete this page https://www.torproject.org/docs/rpms.html.en (or redirect to https://www.torproject.org/docs/tor-doc-relay.html.en)

it is covered by: https://trac.torproject.org/projects/tor/wiki/TorRelayGuide#CentOSRHEL

  1. Redirect the content on this page https://www.torproject.org/docs/tor-relay-debian.html.en to https://www.torproject.org/docs/tor-doc-relay.html.en

  2. Replace the content of this page: https://www.torproject.org/docs/tor-doc-relay.html.en with a single URL (or redirect) to https://trac.torproject.org/projects/tor/wiki/TorRelayGuide

This is related to #24497 (moved).

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