Remove disqus in documentation

doc/misc/footer.html

@@ -7,21 +7,5 @@
   </ul>
 </div>
 <!--END GENERATE_TREEVIEW-->
-<script type="text/javascript">
-    /* * * CONFIGURATION VARIABLES * * */
-    var disqus_shortname = 'rapidjson-doc';
-    
-    /* * * DON'T EDIT BELOW THIS LINE * * */
-    (function() {
-	    var dt = document.createElement('div');
-	    dt.id = "disqus_thread";
-	    (document.getElementsByClassName('contents')[0]).appendChild(dt);
-
-        var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
-        dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
-        (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
-    })();
-</script>
-
 </body>
 </html>