Prepare aside for spaification

 $:livestream()
 
 <div style=text-align:right><button id=enter>Enter Room</button></div>
-
 <div id=chat>
     <div id=mediasoup-demo-app-media-query-detector></div>
     <div id=mediasoup-demo-app-container></div>
 </div>
 
+<div class=page-related>
 $if "aside" in resource:
     $:resource.aside
+</div>
 </aside>
 
 <footer style=display:none id=loading>loading</footer>