frontend: some changes

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

@@ -5,6 +5,7 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{% block title %}RustiCal{% endblock %}</title>
+  <link rel="stylesheet" href="/frontend/assets/style.css" />
   <style>
     * {
       box-sizing: border-box;