Fix: Newsletter panel hidden by default, show it when not logged in

index.html

@@ -107,8 +107,8 @@
         </div>
       </aside>
 
-      <aside class="sidebar-col" id="newsletter-panel">
+      <aside class="sidebar-col hidden" id="newsletter-panel">
-        <div class="newsletter-panel hidden">
+        <div class="newsletter-panel">
           <h3 class="hide-de">Newsletter</h3>
           <h3 class="hide-en">Newsletter</h3>
           <form id="newsletter-form">