docs(react-router): working on v9 migration docs for react router

Author: ShaneK

docs/react/add-to-existing.md

@@ -300,23 +300,16 @@ Then, create `src/pages/Home.css`:
 
 #### 5. Set up Routing
 
-:::important
-
-Ionic React Router currently only supports React Router v5. You must install the following specific versions of the router packages to set up routing with Ionic React.
-
-:::
-
 Install the router packages:
 
 ```bash
-npm install @ionic/react-router react-router@5 react-router-dom@5
-npm install @types/react-router-dom --save-dev
+npm install @ionic/react-router react-router react-router-dom
 ```
 
 Then, update `src/App.tsx` to add the routes for the Home page:
 
 ```tsx title="src/App.tsx"
-import { Redirect, Route } from 'react-router-dom';
+import { Route, Navigate } from 'react-router-dom';
 import { IonApp, IonRouterOutlet, setupIonicReact } from '@ionic/react';
 import { IonReactRouter } from '@ionic/react-router';
 import Home from './pages/Home';
@@ -329,12 +322,8 @@ const App: React.FC = () => (
   <IonApp>
     <IonReactRouter>
       <IonRouterOutlet>
-        <Route exact path="/home">
-          <Home />
-        </Route>
-        <Route exact path="/">
-          <Redirect to="/home" />
-        </Route>
+        <Route path="/home" element={<Home />} />
+        <Route path="/" element={<Navigate to="/home" replace />} />
       </IonRouterOutlet>
     </IonReactRouter>
   </IonApp>