WIP: Add Traefik reverse-proxy support

[ajlennon]

This allows us to access MING containers such as Node-Red and Grafana without needing to open different ports

• Port :8080 is used for the Traefik admin web UI
• Port :80 is use for everything else

http://foo:80/node-red is mapped to the node-red container http://foo:80/grafana is mapped to the grafana container http://foo:80/ is also mapped to the grafana container

This also serves as an example of how to configure Traefik to access containers remotely via port :80

[ajlennon]

This is currently using my fork of the balena-node-red as we need to be able to configure the Node-Red webserver root path.

    image: bh.cr/gh_ajlennon/balena-node-red

If we can get my PRs into the upstream Balena Labs balena-node-red repo this I can change this reference back and convert this WIP draft into a PR.