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.

app/Http/Controllers/SiteController.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Site;
+use Illuminate\Contracts\View\View;
+
+class SiteController extends Controller
+{
+    public function show(Site $site): View
+    {
+        $pages = $site->pages()->orderBy('url')->paginate(50);
+
+        return view('sites.show', ['site' => $site, 'pages' => $pages]);
+    }
+}