Fix cart display, menu styling, and documentation formatting

- Add menu include to cart.php so the page displays properly
- Link header.css stylesheet in cart.php
- Change My Account from prominent button to regular nav link in menu
- Update all 148 game documentation files with proper Quick Info from XML configs
- Fix contrast issues in Quick Info (dark blue background with white text)
- Add Font Awesome icons and fix contrast in Important Notes (dark orange background)
- Sort games alphabetically (case-insensitive) in docs.php
- Add Font Awesome CDN link to docs.php

Co-authored-by: iaretechnician <2749183+iaretechnician@users.noreply.github.com>

modules/billing/docs.php

@@ -77,7 +77,8 @@ function getDocCategories($docsDir) {
         if ($a['order'] !== $b['order']) {
             return $a['order'] - $b['order'];
         }
-        return strcmp($a['name'], $b['name']);
+        // Sort alphabetically by name
+        return strcmp(strtolower($a['name']), strtolower($b['name']));
     });
     
     return $categories;
@@ -122,6 +123,7 @@ uksort($grouped, function($a, $b) use ($grouped) {
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title><?php echo $action === 'view' ? 'Documentation' : 'Documentation - GameServers.World'; ?></title>
     <link rel="stylesheet" href="css/header.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" integrity="sha512-iecdLmaskl7CVkqkXNQ/ZH/XLlvWZOJyj7Yy7tcenmpD1ypASozpmT/E0iPtmFIB46ZmdtAc9eNBvH0H/ZpiBw==" crossorigin="anonymous" referrerpolicy="no-referrer" />
     <style>
         :root {
             --bg: #0f172a;