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
team#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.

This is non-normative, so doesn't need discussion.

The bootstrap starts from `/target`, which is unusual in the FHS, but
it's better to live with what's out there than the ideal world.

Those do not work for people not using TB, while the reverse was
working for both.

The change was also hard to decode: it turns out it only changed to
links to point to the roadmap items instead of the issues.

When the `bullseye.mdwn` page was renamed (to `bullseye.md`) in this
commit:

commit 6fe448dc
Author: Antoine Beaupré <anarcat@debian.org>
Date:   Wed Sep 1 11:33:12 2021 -0400

    rename bullseye upgrade procedure file

    This is the only .mdwn file out there, strangely. Let's hope this is
    going to fix the garbled display issues, where code blocks show up
    with <pre><code> blobs.

diff --git a/howto/upgrades/bullseye.mdwn b/howto/upgrades/bullseye.md
similarity index 100%
rename from howto/upgrades/bullseye.mdwn
rename to howto/upgrades/bullseye.md

... the CI failed, because the hook couldn't find the `.mdwn` file to check:

https://gitlab.torproject.org/tpo/tpa/wiki-replica/-/jobs/35296

The actual error was:

$ ./bin/mdl-wrapper $(cat changed-files.txt)
checking file howto/upgrades/bullseye.md...
checking howto/upgrades/bullseye.mdwn...
/usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/lib/mdl/doc.rb:50:in `read': No such file or directory @ rb_sysopen - howto/upgrades/bullseye.mdwn (Errno::ENOENT)
	from /usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/lib/mdl/doc.rb:50:in `new_from_file'
	from /usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/lib/mdl.rb:82:in `block in run'
	from /usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/lib/mdl.rb:80:in `each'
	from /usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/lib/mdl.rb:80:in `run'
	from /usr/lib/ruby/gems/2.6.0/gems/mdl-0.11.0/bin/mdl:10:in `<top (required)>'
	from /usr/bin/mdl:23:in `load'
	from /usr/bin/mdl:23:in `<main>'
Cleaning up file based variables 00:03
ERROR: Job failed: exit code 1

In our code, we assume that if a path is not a file, it's a directory,
but that's not quite right: it could also be just missing!

So handle that other case more elegantly.

It's where I looked for it first, and the gitlab page is waay to
long. We keep a pointer anyways, so that people can find it in both places.

Seems like this may fix team#40376

This reverts commit 96f23a82.