fix: enhance shortcut key detection for alt key combinations and update Discord invite link across all pages.

src/pages/bookmark.html

@@ -462,7 +462,7 @@
                   clip-rule="evenodd" />
               </svg>
             </a>
-            <a href="https://discord.gg/q42xWQmJ" target="_blank" rel="noopener noreferrer"
+            <a href="https://discord.gg/AP2Y97juZT" target="_blank" rel="noopener noreferrer"
               class="text-gray-400 hover:text-indigo-400" title="Discord">
               <svg class="w-6 h-6" fill="currentColor" viewBox="0 0 24 24" aria-hidden="true">
                 <path
@@ -494,4 +494,4 @@
   <script type="module" src="../js/mobileMenu.ts"></script>
 </body>
 
-</html>
+</html>