credit to lavamind for this procedure, see team#41396#note_2966380

See: team#41969

Closes: tpo/tpa/puppet-hiera-enc#1

cf. team#41991

Still incomplete, not hooked into anything... I have had this in my
local tree for months at this point, and it seems better to commit it
that to leave it lying around like this.

We stop short of rewriting all playbooks for Prometheus, and instead
add references to the task of adding playbooks for
everything (prometheus-alerts#16) where we found references to
nagios.

It took me a while to reach that today.

I kept having trouble finding links to the right thing. Hopefully this
will clarify things.

I forgot to change it after the copy/paste

Mostly consistency in capitalization, adding some links to related
issues, spell-checking and splitting long sentences.

See: team#41948

They don't seem to like GitLab links to wiki pages. :-(

See: https://gitlab.torproject.org/tpo/tpa/wiki-replica/-/jobs/820082

Prevent this error:

    (stdin): Kramdown Warning: No link definition for link ID 'toc' found on line 7

See: https://gitlab.torproject.org/tpo/tpa/wiki-replica/-/jobs/820071

refs team#41948

refs team#41948

refs team#41948

refs tpo/tpa/tails/sysadmin#18166