'darkzen' color profile for HTMLs generated by mdvimb

Get current version at https://netvor.info/scripts/mdvimb

Turns out I keep thinking of it all the time

This will make it easier to control appearance per host, as we already
have setup for per-host XRDB resources.

Or rather the frontend had changed syntax, because this used to work.
This will suffice until we come up with proper syntax or something...

This will enable us to make use of the `set_from_resource` i3 feature.

This makes it easier to join output from several modules and keep it
valid.  (Given modules *do* print the comma.)

See also:

    https://github.com/koalaman/shellcheck/issues/1342

Work around, obey, or disable.

Mostly for easier visual distinction and also for fun.