also add a wildcard to the suggested find command so that it matches
things like `hostname.torproject.org.yaml`

That doesn't change anything from non-SSD wipes and just takes more
time for no reason.

After one too many pipeline failures due to old spell-checking
mistakes, I decided to own up to my stuff and spell check
everything. I actually ran:

     codespell --interactive 3 --write-changes *

And dealt with *almost* all the errors, except stuff in old/ which
I'll remove shortly.

When an error comes up now, it is new and should be fixed.

wipefs will clear out the LUKS header very quickly which should render
the disk undecryptable, even with the master key. It's a good first
step that should work even on a running system.

This is basically ganeti, ipsec, iscsid, multipathd and timers, not
sure the latter actually works.

I had segfaults on nwipe on window resizes, hopefully that will help.

... that's as much i could do in a reasonable amount of time, but
there's a lot of references to it everywhere. There's certainly still
stuff referencing git.tpo as well.

The rationale here is that Ganeti has its own inventory and capacity
evaluation system, so we do not *need* the Spreadsheet for that
purpose. We still do need the spreadsheet for cost tracking however,
so keep the documentation procedure for machines that "are not in
Ganeti", basically.