Use onClick event listener to change page

src/screens/App.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import 'rsuite/lib/styles/index.less';
 import { Container } from 'rsuite';
-import { BrowserRouter as Router, Switch, Route, Link } from 'react-router-dom';
+import { BrowserRouter as Router, Switch, Route } from 'react-router-dom';
 
 import Login from './Login';
 import Register from './Register';