feat: add Sites Livewire CRUD page

routes/web.php

@@ -1,7 +1,13 @@
 <?php
 
+use App\Livewire\Sites\Index as SitesIndex;
 use Illuminate\Support\Facades\Route;
 
 Route::get('/', function () {
     return view('welcome');
 });
+
+Route::get('/sites', SitesIndex::class)->name('sites.index');
+
+// placeholder, replaced in Task 6
+Route::get('/social-accounts', SitesIndex::class)->name('social-accounts.index');