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.

See https://whetstone.privatestorage.io/privatestorage/PrivateStorageio/-/merge_requests/103#note_13854

Remove the VirtualBox GUI, see
https://search.nixos.org/options?channel=21.05&show=virtualisation.virtualbox.host.headless&from=0&size=50&sort=relevance&query=virtualbox

... if you are reading this not in the repo, but from the web page, you might
not know where to go to make all those nice commands work.

The original domain got some state created for it by certbot.  The
certificates are anchored to `payments.privatestorage.io` in the filesystem.
The code handling these domains uses the first domain name in the list to find
the certificates, so make it match the filesystem state.

The default case was actually catastrophically bad for any actual deployment
since it would just lock everyone out of all the systems.

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

... clean up