Update link & description for WHS

docs/manual/introduction/Useful-links.html

@@ -113,7 +113,7 @@
  			graphics to students learning physics and math.
 		 </li>
 		 <li>
-			 [link:http://whitestormjs.xyz/ Whitestorm.js] – A wrapper around Three.js and custom [link:https://github.com/chandlerprall/Physijs physi.js].
+			 [link:https://whs.io/ Whitestorm.js] – Modular three.js framework with AmmoNext physics plugin.
 		 </li>
 
 		<li>