Fix broken link

Author: webknjaz

_includes/themes/metromongo/frontpage.html

@@ -60,11 +60,11 @@ <h3>Coming Soon...</h3>
           <div class="sl-slide-inner bg-4">
             <h3>Tutorial</h3>
             <blockquote><p>
-              <a href="http://docs.mongodb.org/manual/tutorial/write-a-tumblelog-application-with-flask-mongoengine/">
+              <a href="http://docs.mongodb.org/ecosystem/tutorial/write-a-tumblelog-application-with-flask-mongoengine/">
                 Build a tumblelog with Flask</a>
               </p>
               <p>
-              <a href="http://docs.mongodb.org/manual/tutorial/write-a-tumblelog-application-with-flask-mongoengine/">
+              <a href="http://docs.mongodb.org/ecosystem/tutorial/write-a-tumblelog-application-with-flask-mongoengine/">
               <img src="{{ ASSET_PATH }}metromongo/images/tumblelog.png"></a>
               </p></blockquote>
           </div>