title fix 2021->2023

theme/templates/base.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="icon" href="/static/img/favicon.png" type="image/png">
     <title>
-            {% block title %}Hacken Open Air 2::21{% endblock %}
+            {% block title %}Hacken Open Air 2::23{% endblock %}
     </title>
     <link rel="stylesheet" href="/static/css/hoa.css">
   </head>