Allow basic authentication for monitoring websites

[MFatigati]

Completed: Traefik uses bcrypt to allow a single password for the "admin" username on traefik, grafana and prometheus dashboard.

Seems to work, verify tomorrow:

• Grafana needs to skip TLS verification of prometheus, at least for now, and access prometheus as a server, not directly, so that it does not get caught up in the Traefik authentication:

- name: Prometheus
  # <string, required> datasource type. Required
  type: prometheus
  # <string, required> access mode. direct or proxy. Required
  access: proxy
// ...
  jsonData:
     graphiteVersion: "1.1"
     tlsAuth: false
     tlsAuthWithCACert: false
     tlsSkipVerify: true

• Grafana needs to be run with the following environment variables in the docker compose, so avoid a double login page:

  environment:
    - GF_AUTH_BASIC_ENABLED=false
    - GF_AUTH_DISABLE_LOGIN_FORM=true
    - GF_AUTH_ANONYMOUS_ENABLED=true
    - "GF_AUTH_ANONYMOUS_ORG_NAME=Main Org."
    - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin