update local server links to new sandcastle

Author: jjspace

index.html

@@ -32,12 +32,11 @@
             <a href="Apps/HelloWorld.html">Hello World</a>
           </li>
           <li>
-            <a href="Apps/Sandcastle/index.html">Sandcastle</a>
+            <a href="Apps/Sandcastle2/index.html">Sandcastle</a>
             <ul>
               <li>
-                <a href="Build/Apps/Sandcastle/index.html">Built Sandcastle</a>
+                <a href="Apps/Sandcastle/index.html">Legacy Sandcastle</a>
               </li>
-              <li><a href="Apps/Sandcastle2/index.html">Sandcastle v2</a></li>
             </ul>
           </li>
           <li>

index.release.html

@@ -90,7 +90,7 @@ <h2>Local links</h2>
               </td>
             </tr>
             <tr>
-              <td><a href="Apps/Sandcastle/index.html">Sandcastle</a></td>
+              <td><a href="Apps/Sandcastle2/index.html">Sandcastle</a></td>
               <td>
                 Cesium's live code editor and example gallery. Browse examples
                 highlighting features of the Cesium API and edit and run them