Add first pass of the web interface: Sites index + detail, via Livewire

Home page is now a Livewire-powered, searchable/paginated Site list
(search by domain) instead of the stock Laravel welcome page. Clicking
a site goes to a plain controller-rendered detail page listing its
pages. Shared layout at resources/views/components/layouts/app.blade.php.

routes/web.php

@@ -1,7 +1,8 @@
 <?php
 
+use App\Http\Controllers\SiteController;
+use App\Livewire\Sites\Index as SitesIndex;
 use Illuminate\Support\Facades\Route;
 
-Route::get('/', function () {
-    return view('welcome');
-});
+Route::get('/', SitesIndex::class)->name('sites.index');
+Route::get('/sites/{site}', [SiteController::class, 'show'])->name('sites.show');