Use docker extensions for env variables

docker-compose.development.yml

@@ -5,13 +5,9 @@ volumes:
   node-modules:
 
 services:
-  db:
-    env_file: ./.development.env
-
   celery:
     build:
       target: development
-    env_file: ./.development.env
     volumes:
       - ./src/:/app/src
 
@@ -19,7 +15,6 @@ services:
     build:
       target: development
     command: python /app/src/manage.py runserver 0.0.0.0:8000
-    env_file: ./.development.env
     ports:
       - "${DJANGO_PORT:-8000}:8000"
     volumes: