chore: replace Swarm Desktop link

Author: filoozom

src/index.html

@@ -160,7 +160,7 @@ <h4>
           <div class="spacer"></div>
 
           <div class="more btn btn-light">
-            <a class="nav-link" href="https://docs.ethswarm.org/docs" target="_blank">
+            <a class="nav-link" href="https://desktop.ethswarm.org/" target="_blank">
               <span class="navlink">learn more about Swarm Desktop app</span>
             </a>
           </div>