Fehlerkorrekturen und FInktionserweiterung

adventskalender/index.php

@@ -5,6 +5,7 @@
   <title>Bratonien Adventskalender</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <link rel="stylesheet" href="shared/css/style.css">
+  
 </head>
 <body>
   <?php include __DIR__ . '/includes/header.html'; ?>
@@ -21,5 +22,6 @@
   </main>
 
   <?php include __DIR__ . '/includes/footer.html'; ?>
+  <script src="/shared/js/header.js" defer></script>
 </body>
 </html>