NOTE: The majority of traefik ports were totally broken and would never have worked. It should be the external port there, not the internal container port!.
Port conflicts were fixed.
* Rejig of playbook to load roles from ansible-galaxy
* Remove ansible-nas role and move tasks to tasks directory
* Add InfluxDB/Telegraf/Grafana for monitoring & dashboards
* Automatically configure InfluxDB as a datasource in Grafana
* Switch to ZFS Docker driver
* Add note about switching to overlay2 Docker driver if required
