Add NotepadTextDashed icon to Documentation button

Updated the Documentation button to include a NotepadTextDashed icon from lucide-react. This change improves visual consistency and enhances user experience by aligning with the icon usage pattern established in the Accueil button.

apps/frontend/src/app/page.tsx

@@ -1,7 +1,7 @@
 "use client"
 import { useState } from 'react';
 import { Button } from '../components/ui/button';
-import { Home } from 'lucide-react';
+import { Home, NotepadTextDashed } from 'lucide-react';
 
 
 
@@ -29,7 +29,10 @@ function SubPageSelector() {
         <Home/>
         Accueil
       </Button>
-      <Button>Documentation</Button>
+      <Button>
+        <NotepadTextDashed />
+        Documentation
+      </Button>
     </div>
   )
 }