remove the outdated docker-compose file

I will add a correct production ready file at a later point

docker-compose.yml

@@ -1,28 +0,0 @@
-version: '3'
-
-services:
-  db:
-    image: postgres
-    environment:
-      - POSTGRES_DB
-      - POSTGRES_PASSWORD
-    volumes:
-      - ./db_data:/var/lib/postgresql/data/
-
-  backend:
-    image: nebucatnetzer/network_inventory
-    volumes:
-      - .:/code
-    environment:
-      - DJANGO_SETTINGS_MODULE
-      - DJANGO_DEBUG
-      - DJANGO_SECRET_KEY
-    depends_on:
-      - db
-
-  frontend:
-    build: frontend/.
-    depends_on:
-      - backend
-    ports:
-      - 80:80