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.

doc/reporting-email-problems.md

@@ -29,4 +29,4 @@ If you can't send a copy of the original message for privacy reasons,
 at least include the headers of the email.
 
 Send us the message using the regular methods, as appropriate, see
-[doc/how-to-get-help](doc/how-to-get-help) for details.
+the [support guide](support) for details.