Update mooc.fi link

Author: nygrenh

securing/index.html

@@ -20,7 +20,7 @@
   <!-- BEGIN NAV -->
   <header role="navigation">
     <h1>
-      <a href="http://mooc.fi" alt="MOOC" target="_blank">
+      <a href="https://mooc.fi" alt="MOOC" target="_blank">
         <span class="icon-mooc"></span>
       </a>
       <button type="button" data-toggle="collapse" data-target=".bs-navbar-collapse">