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.

support.md

+# Need help?
+
+If you need help from the sysadmin team (or even if you're not sure
+which team!), please do contact us using one of the following
+mechanisms:
+
+<!-- this is a copy paste from policy/tpa-rfc-2-support.md, update -->
+<!-- the other page if this is changed -->
+
+## Quick question: chat
+
+If you have "just a quick question" or some quick thing we can help
+you with, ask us on IRC: you can find us in `#tpo-admin` on
+`irc.oftc.net` and in other tor channels.
+
+It's possible we ask you to create a ticket if we're in a pinch. It's
+also a good way to bring your attention to some emergency or ticket
+that was filed elsewhere.
+
+## Bug reports, feature requests and others: issue tracker
+
+Most requests and questions should go into the issue tracker, which is
+currently [GitLab][] ([direct link to a new ticket form][]). Try to find
+a good label describing the service you're having a problem with, but
+in doubt, just file the issue with as much details as you can.
+
+You can also mark an issue as confidential, in which case only members
+of the team (and the larger "tpo" organisation on GitLab) will be able
+to read it.
+
+[GitLab]: https://gitlab.torproject.org/tpo/tpa/team/
+[direct link to a new ticket form]: https://gitlab.torproject.org/tpo/tpa/team/-/issues/new
+
+## Private question and fallback: email
+
+If you want to discuss a sensitive matter that requires privacy or are
+unsure how to reach us, you can always write to us by email, at
+[torproject-admin@torproject.org][].
+
+[torproject-admin@torproject.org]: mailto:torproject-admin@torproject.org
+
+For details on those options and our support policy, including support
+levels, supported services and timelines, see the [TPA-RFC-2: support policy](policy/tpa-rfc-2-support).