Update FractionAddition.html

Remove image and link to CTAT web site.

Examples/FractionAddition.html

@@ -84,11 +84,6 @@ function ctatOnload() {
       <div id="done" class="CTATDoneButton" tabindex="9" style=""></div>
       <div id="hint" class="CTATHintButton" tabindex="10" style=""></div>
     </div>
-    <div style="position: absolute; bottom:0;">
-      <a href="http://ctat.pact.cs.cmu.edu/">
-	<img alt="CTAT: Cognitive Tutor Authoring Tools" style="width:330px; margin-left: 10px; margin-top: 20px;" src="skindata/CTAT_Banner.svg">
-      </a>
-    </div>
   </div>
   <br>
 </div>