fix: add missing Howler.js dependency to contact.html (#222)

* Initial plan

* fix: add missing Howler.js to contact.html to prevent ReferenceError

Agent-Logs-Url: https://github.com/DavidKRK/DavidKRK.github.io/sessions/de4fd954-b769-42c5-8e0f-9b37fc76373d

Co-authored-by: DavidKRK <136035295+DavidKRK@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: DavidKRK <136035295+DavidKRK@users.noreply.github.com>

Author: Copilot

contact.html

@@ -177,6 +177,7 @@ <h1 class="main-title">David KRK</h1>
       </footer>
     </div>
 
+    <script src="https://cdn.jsdelivr.net/npm/howler@2.2.3/dist/howler.core.min.js"></script>
     <script src="assets/js/main.js"></script>
     <script>
       document.addEventListener('DOMContentLoaded', () => {