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.

policy/tpa-rfc-2-support.md

@@ -40,6 +40,8 @@ Which we translate in the following policy proposals:
 
 <a name="how-to-get-help"></a>
 
+<!-- if this section gets changed, also change support.md -->
+
 ## Support channels
 
 Support requests and questions are encouraged to be documented and