create a new "support" page
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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.