feat: add PDF link button to footer

index.html

@@ -350,8 +350,11 @@
       </div>
     </section>
 
-    <footer>
+    <footer style="display: flex; flex-direction: column; align-items: center; gap: 14px;">
-      Cheers! Let's celebrate 🎉
+      <a href="Getraenkekarte.pdf" target="_blank" style="display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 999px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15); color: #cbd5e1; text-decoration: none; font-size: 12px; font-weight: 600;">
+        📄 PDF Version öffnen
+      </a>
+      <div>Cheers! Let's celebrate 🎉</div>
     </footer>
   </div>