remove old docker-compose files

docker-compose.override.yml

-version: "2.1"
-
-services:
-  nginx:
-    ports:
-      - "80:80"
-      - "8080:8080"

docker-compose.prod.yml

-version: "2.1"
-
-networks:
-  webproxy:
-    default:
-    external: true
-
-services:
-  nginx:
-    environment:
-      VIRTUAL_HOST: web.villas.fein-aachen.org
-      LETSENCRYPT_HOST: web.villas.fein-aachen.org
-      LETSENCRYPT_EMAIL: post@steffenvogel.de
-    networks:
-      - default
-      - webproxy
-