Comment out Scala Days Sponsors banner

Commented out the Scala Days Sponsors banner include.

Author: anatoliykmetyuk

_layouts/frontpage.html

@@ -16,6 +16,8 @@
         </p>
         <span class="hide"><i class="fa fa-close"></i></span>
       </div>
+      <!-- Uncomment the line below to enable the Scala Days Sponsors banner -->
+      <!-- {% include scala-days-sponsors.html %} -->
       <div class="wrap">
         <!-- Navigation -->
         <nav class="navigation" role="menu">