Code cleanup: remove unused docker compose config files

docker-compose.override.yml

@@ -1,8 +0,0 @@
-version: '3'
-
-services:
-###> doctrine/doctrine-bundle ###
-  database:
-    ports:
-      - "5432"
-###< doctrine/doctrine-bundle ###

docker-compose.yml

@@ -1,21 +0,0 @@
-version: '3'
-
-services:
-###> doctrine/doctrine-bundle ###
-  database:
-    image: postgres:${POSTGRES_VERSION:-13}-alpine
-    environment:
-      POSTGRES_DB: ${POSTGRES_DB:-app}
-      # You should definitely change the password in production
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-ChangeMe}
-      POSTGRES_USER: ${POSTGRES_USER:-symfony}
-    volumes:
-      - db-data:/var/lib/postgresql/data:rw
-      # You may use a bind-mounted host directory instead, so that it is harder to accidentally remove the volume and lose all your data!
-      # - ./docker/db/data:/var/lib/postgresql/data:rw
-###< doctrine/doctrine-bundle ###
-
-volumes:
-###> doctrine/doctrine-bundle ###
-  db-data:
-###< doctrine/doctrine-bundle ###