Include the color config for mako from ~/.local/state/mako/style instead
of hardcoding it or templating it into the config file.
This means we have to ensure the directory and file exist before running
mako which we do with an `env.d` startup script.
Since the existing wayland module basically describes everything about
my 'desktop environment' setup already anyway, might as well rename it
accordingly. Additionally, mako is important for notifications in this
environment so it moves here as well.