feat: Add custom error pages

fixes #189 https://github.com/rico-vz/HeimerdingerLoL/issues/189
- Created custom error pages with specific messages and designs for HTTP status codes.
- Each page includes a title, description, appropriate message content, and a link to return to the homepage.

resources/views/errors/500.blade.php

@@ -0,0 +1,16 @@
+@extends('layouts.app')
+
+@section('title', 'Heimerdinger • 500')
+@section('description', 'Explore League of Legends champions, skins, and game assets on Heimerdinger.')
+
+@section('content')
+
+<div class="flex items-center justify-center h-screen">
+    <div class="text-center">
+        <h1 class="font-bold text-orange-400 text-8xl">500</h1>
+        <h2 class="text-3xl font-bold text-white">Internal Server Error</h2>
+        <p class="mb-8 text-stone-300">An unexpected error occurred on the server.</p>
+        <a href="/" class="px-4 py-2 mt-4 text-white bg-orange-400 rounded-md hover:bg-orange-500">Go back to the homepage</a>
+    </div>
+</div>
+@endsection