use only .env files

pad/README.md

@@ -7,6 +7,8 @@ http://etherpad.org/
 export MYSQL_ROOT_PASSWORD=$(openssl rand -base64 32)
 echo MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD >> .env
 echo ETHERPAD_DB_PASSWORD=$MYSQL_ROOT_PASSWORD >> .env
+echo ETHERPAD_DB_HOST=db >> .env
+echo ETHERPAD_TITLE=Bloc Note >> .env
 ```
 
 ## Deploy

pad/docker-compose.yml

@@ -18,9 +18,6 @@ services:
     restart: always
     env_file:
       - .env
-    environment:
-      - ETHERPAD_DB_HOST=db
-      - ETHERPAD_TITLE=Bloc Note
     labels:
       traefik.enable: "true"
       traefik.backend: "etherpad"