feat: Enhance social media sharing meta image for blogpost

- Update OpenGraph and Twitter meta tags in app.blade.php to dynamically set og:image based on content.
- Modify show.blade.php to include post thumbnail as og_image for better social media sharing.

resources/views/posts/show.blade.php

@@ -1,9 +1,11 @@
 @use('Carbon\Carbon')
 @extends('layouts.app')
 
-@section('title', $post->title . ' • Heimerdinger.LoL')
+@section('title', $post->title)
 @section('description', 'Heimerdinger.LoL: ' . $post->description)
 
+@section('og_image', $post->thumbnail)
+
 @push('meta_tags')
     <link rel="canonical" href="{{ config('app.HEIMER_URL') . '/post/' . $post->slug }}">