message: Add clean script to plugins/lighthouse
diff: "build:watch": "backstage-cli plugin:build --watch",
  "build": "backstage-cli plugin:build",
  "lint": "backstage-cli lint",
  - "test": "backstage-cli test"
  + "test": "backstage-cli test",
  + "clean": "backstage-cli clean"
  },
  "dependencies": {
  "react-markdown": "^4.3.1",
  