spotted in tpo/tpa/team#40432

Related to tpo/tpa/team#40432.

the shim failed to migrated back to chi-node-08: the console was hung,
and shutdown wasn't working either. so advise against that as well.

I got bit by this and tried to send to `?channel=#tpo-admin`, which
obviously fails because # is a special character. Easier to just skip
the pound sign altogether.

chi-node-08 wasn't seeing the disks, presumably because this wasn't
ran.

This actually worked the first time.

This reverts commit 9db505fe.

i hate you markdown, but just now.

we keep the arrow keys stuff as that's still valuable, of course, but
in a separate section.

all the Dell stuff should probably be moved to a separate page...