Internal Reverse Proxy and HTTPS

- Traefik container & labels
- Optionally set certificates etc. domain names in station.yml
- For letsencrypt certificates only provide domain name
- Reverse Proxy for services
    -  <station_url> -> Station UI
    -  <station_url>/api -> Station API
    -  <station_url>/airflow -> Airflow UI
    -  <station_url>/minio -> Minio UI  