Bugfix/fix baseline traefik config

[SuperITMan]

As mentioned in docker/compose#9570, - character is no longer supported in ".env".

Due to this issue, we can no longer start the baseline with docker-compose. We receive the following error:

$ docker-compose up -d

unexpected character "-" in variable name near "TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_EMAIL=postmaster@example.com\n\n\n#Choose one of the challenges : TLS or DNS \n#when you choose one, the other method have to be set on 'false' \n\n#      TLS Challenge\n\nTRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_TLSCHALLENGE=true\n\n\n\n#                                            #This is for the dns Challenge, see https://doc.traefik.io/traefik/user-guides/docker-compose/acme-dns/\n#                                            #On some instances, I use DNS challenge in order to have wildcard certificates \n#                                            #If you're also using OVH : https://medium.com/nephely/configure-traefik-for-the-dns-01-challenge-with-ovh-as-dns-provider-c737670c0434\n\n\n#TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_CASERVER=https://acme-v02.api.letsencrypt.org/directory  \n#TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE=TRUE\n#TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE_PROVIDER=ovh\n#TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE_DELAYBEFORECHECK=10\n#OVH_ENDPOINT=\n#OVH_APPLICATION_KEY=\n#OVH_APPLICATION_SECRET=\n#OVH_CONSUMER_KEY=\n\n\n\n\n\n\n\n                                                                ######################################\n                                                                #        Automatic updates           #\n                                                                ######################################\nWATCHTOWER_POLL_INTERVAL=3600\nWATCHTOWER_CLEANUP=TRUE\nWATCHTOWER_LABEL_ENABLE=TRUE\nWATCHTOWER_NOTIFICATIONS=slack\nWATCHTOWER_NOTIFICATION_SLACK_HOOK_URL=\"\"\nWATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER=\"Docker updates - \"\n\nWATCHTOWER_NOTIFICATION_EMAIL_FROM=\nWATCHTOWER_NOTIFICATION_EMAIL_TO=\nWATCHTOWER_NOTIFICATION_EMAIL_SERVER=\nWATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=\nWATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=\nWATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=\nWATCHTOWER_NOTIFICATION_EMAIL_SUBJECTTAG=(Docker updates)\nWATCHTOWER_NOTIFICATION_EMAIL_DELAY=2\n\n\n\n"

This can be reproduced like this:

1. clone docker-instances repository
2. go in baseline folder
3. rename ".env.dist" in ".env"
4. run docker-compose up -d

This PR contains a BREAKING CHANGE regarding the variable names in the ".env" file.
The following variables MUST be renamed in .env file:

• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_EMAIL -> TRAEFIK_ACME_EMAIL
• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_TLSCHALLENGE -> TRAEFIK_ACME_TLSCHALLENGE
• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_CASERVER -> TRAEFIK_ACME_CASERVER
• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE -> TRAEFIK_ACME_DNSCHALLENGE
• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE_PROVIDER -> TRAEFIK_ACME_DNSCHALLENGE_PROVIDER
• TRAEFIK_CERTIFICATESRESOLVERS_lets-encrypt_ACME_DNSCHALLENGE_DELAYBEFORECHECK -> TRAEFIK_ACME_DNSCHALLENGE_DELAYBEFORECHECK