Westend->Millau headers relay in deployments (#831)

* reorganize monitoring

* Westend->Millau bridge

* support multiple bridges

* initialize Westend -> Millau bridge byMillau.George

* fix intersecting ports

* ignore dashboards

* single bridged network

* deal with multple --env-file args

* fix chain name

* use images from docker hub

* update show_help

* updated comment

* mount whole dashboards directory

* removed unneeded network

* reverted reverse-proxy changes

* prometheus -> targets

* separate Grafana.Dockerfile with builtin /etc/grafana

* Revert "separate Grafana.Dockerfile with builtin /etc/grafana"

This reverts commit 53e04c45.

* read dashboards from /etc/grafana/dashboards

* stop comment