use create react app to simplify the application

src/index.tsx

@@ -0,0 +1,11 @@
+import React from "react";
+import ReactDOM from "react-dom";
+import App from "./components/App";
+import "./index.scss";
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById("root")
+);