Put its contents in it and then use them from there instead of importing them
all over the rest of the code.

Also change the `domain` parameter for Grafana to always
use that beautiful name - besides display it's cosmetic anyway
IIANM so I'll not parametrize it for now.

More flexibility and less dots in config files.
Implements #65.

Discern make-issuer.nix from issuer.nix better.

Also put library code in a library directory

And account for the odd-host-out. :/  See if you can spot it.

There will be no staging grid and the other two nodes in this grid went
elsewhere.

Define testing grid and production grid with a function they can share.