feat: upgrade font-awesome to v7

categories.php

@@ -44,7 +44,7 @@ if ($categoryId && isset($allCategories[$categoryId])) {
     <meta name="csrf-token" content="<?php echo generateCSRFToken(); ?>">
     <title><?php echo htmlspecialchars($categoryName); ?> - kaubuntu.re</title>
     <link rel="stylesheet" href="css/styles.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css">
 
     <!-- Favicons -->
     <link rel="apple-touch-icon" sizes="180x180" href="img/apple-touch-icon.png">