The URLS file is no longer necessary as urls are now generated directly from the app VHOST file.
This also moves all the url generation logic to the domains plugin.
This plugin uses a docker-compose based Caddy installation in conjunction with injected container labels to route requests. It only exposes the minimal necessary for routing traffic to docker containers. Users wishing to customize further labels may explore using the docker-options plugin to attach additional labels during the 'deploy' phase.
