frontend: remove htmx

crates/frontend/public/templates/layouts/default.html

@@ -5,7 +5,6 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{% block title %}RustiCal{% endblock %}</title>
-  <script src="/frontend/assets/htmx.org.js"></script>
   <style>
     * {
       box-sizing: border-box;
@@ -19,5 +18,4 @@
     {% block content %}<p>Placeholder</p>{% endblock %}
   </div>
 </body>
-
 </html>