[NC] Update app skeleton mountpoint for upgrades to run smoothly

nextcloud/docker-compose.yml

@@ -49,7 +49,7 @@ services:
       - db
     volumes:
       - ${DATA_PATH}/app/html:/var/www/html
-      - ${DATA_PATH}/app/skeleton:/var/www/html/gnous-skeleton:ro
+      - ${DATA_PATH}/app/skeleton:/var/www/gnous-skeleton:ro
     restart: unless-stopped
     env_file: secrets/app.secrets
     environment: