refactor(example): use create-react-app instead of parcel

example/src/index.js

@@ -0,0 +1,21 @@
+import React from '../../node_modules/react';
+import ReactDOM from 'react-dom';
+import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
+
+import Advanced from './Advanced';
+import Basic from './Basic';
+
+import './index.css';
+
+ReactDOM.render((
+  <Router>
+    <Switch>
+      <Route path="/basic">
+        <Basic />
+      </Route>
+      <Route path="/">
+        <Advanced />
+      </Route>
+    </Switch>
+  </Router>
+), document.getElementById('root'));