chore: add clean script to package.json

Author: Joona Ojapalo

package.json

@@ -13,6 +13,9 @@
   ],
   "scripts": {
     "setup": "yarn install && yarn build-workspaces && yarn node14-patch",
+    "clean": "yarn clean:generated yarn && yarn clean:node_modules",
+    "clean:node_modules": "lerna run clean && rm -rf node_modules",
+    "clean:generated": "find app -type d -name __generated__ | xargs rm -r",
     "static": "mkdir -p _static/js; mkdir -p _static/css; cp -r static/* _static",
     "win-static": "xcopy static\\* _static /e /s /y /i& if not exist _static\\js mkdir _static\\js& if not exist _static\\css mkdir _static\\css",
     "prebuild": "yarn run static && yarn run relay",