Remove deprecated MongoDB compose from databases VM

Unifi stack runs entirely on network-services (.121) now

compose-files/databases/mongodb/docker-compose.yml

@@ -1,28 +0,0 @@
-services:
-  unifi-db:
-    image: docker.io/mongo:4.4.29
-    container_name: unifi-db
-    restart: unless-stopped
-    environment:
-      - MONGO_INITDB_ROOT_USERNAME=root
-      - MONGO_INITDB_ROOT_PASSWORD=rootpassword
-      - MONGO_INITDB_DATABASE=unifi
-    volumes:
-      - /mnt/nas/docker/unifi/init-mongo.js:/docker-entrypoint-initdb.d/init-mongo.js:ro
-      - /mnt/nas/docker/unifi/db:/data/db
-    ports:
-      - "27017:27017"
-    networks:
-      - database
-    labels:
-      - "autoheal=true"
-      - "com.centurylinklabs.watchtower.enable=true"
-    deploy:
-      resources:
-        limits:
-          memory: 512M
-          cpus: '1.0'
-
-networks:
-  database:
-    external: true