switch to runestone server for webwork

Author: oscarlevin

publication/runestone.ptx

@@ -8,11 +8,11 @@
         <directories external="../assets" generated="../generated-assets/rs" />
         <version include="interactive runestone" />
     </source>
-        <!-- <webwork
-        server="https://webwork.runestone.academy" course="anonymous" user="anonymous" password="anonymous" task-reveal="preceding-correct" /> -->
+        <webwork
+        server="https://webwork.runestone.academy" course="anonymous" user="anonymous" password="anonymous" task-reveal="preceding-correct" />
         <!-- Note: I can't use the runestone webwork server until I sort out the customizations for image macros that Alex set up for me (only on the aimath server) -->
-    <webwork
-        server="https://webwork-ptx.aimath.org" course="anonymous" user="anonymous" password="anonymous" task-reveal="preceding-correct" />
+    <!-- <webwork
+        server="https://webwork-ptx.aimath.org" course="anonymous" user="anonymous" password="anonymous" task-reveal="preceding-correct" /> -->
 
     <numbering>
         <!-- the divisions element describes the numbering of divisions. -->