The support page is the go-to page for the "how to get help" question,
which previously was hidden inside the TPA-RFC-2 standard.

This basically copies that part of the TPA-RFC-2 policy, but could
eventually diverge without needing to update the policy, for informal
stuff.

I started working on this page while trying to address
#40382 ("document the triage process"), but I'm not
actually sure triage documentation should go there, as this page feels
more targeted at users, and only users.

howto/incident-response.md would seem like a better space for this.

Also, this is a toplevel page because it's more important than
everything else, so it warrants its own special space.

I keep looking for it in howto/ldap and not finding it. this should
help at least a little.

I didn't move the doc/accounts documentation here because I'm not sure
yet I want to operate this migration, see also team#40129

I do this because i keep getting lost in the pages. At least now at
the top there will be a pointer to a ticket which has the full list
and identifies the problems clearly.

I know this might be better implemented as a TPA-RFC, logically, but
i feel we already have rough consensus on this.

The last request for a VM that came in (#40070) really demonstrated to
me the reason for this deprecation: `tekesicola` is certainly a
nice-looking name, but I have no idea what it means or why it was
picked. So it would make someone unfamiliar with the history of that
machine to actually know what it's for.