Rm inactive/moved repo and RSHour from main page

We can think about bringing them back, though since the repo is not under CR anymore, better to keep it away from main page. For RSHour, it is not active, so same thing: can bring it back to main page if it activates again.

Author: samumantha

templates/index/cards.html

@@ -35,7 +35,8 @@ <h2>Lesson materials</h2>
       <a class="uk-button uk-button-primary" href="/lessons/">More ›</a></p>
     </div>
   </div>
-
+  
+  <!--
   <div>
     <div class="uk-card uk-card-default uk-card-hover uk-card-body">
       <a href="/repository/">
@@ -70,4 +71,5 @@ <h2>Research Software Hour</h2>
       <a class="uk-button uk-button-primary" href="https://researchsoftwarehour.github.io/">More ›</a></p>
     </div>
   </div>
+  -->
 </div>