Refactor Docker Compose files for n8n and Portainer: update volume paths and network configurations; remove deprecated n8n configuration file.

portainer-docker-compose.yaml

@@ -5,7 +5,7 @@ services:
     restart: always
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
-      - ./portainer_data:/data
+      - ./volumes/portainer_data:/data
     ports:
       - 9443:9443
       # - 8000:8000  # Remove if you do not intend to use Edge Agents