Create bwauth and dirauths security guidelines?

Talking with @gaba about https://gitlab.torproject.org/tpo/network-health/sbws and bwauths operational and infrastructure security guidelines, we thought it might be interesting to have similar documentation to https://gitlab.torproject.org/legacy/trac/-/wikis/doc/OperationalSecurity, https://gitlab.torproject.org/legacy/trac/-/wikis/TorRelayGuide/Security or https://gitlab.torproject.org/legacy/trac/-/wikis/doc/TorRelaySecurity.

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