point example to local build

Author: jhuleatt

example/package.json

@@ -9,7 +9,7 @@
     "firebase": "^8.1.1",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
-    "react-firebaseui": "5.0.0"
+    "react-firebaseui": "../dist"
   },
   "devDependencies": {
     "ajv": "^6.12.6",