add animated crab

Author: rainliu

index.html

@@ -153,16 +153,9 @@
       </article>
     </div>
   </dev>
-  <!--footer class="footer" style="background-color:#fff">
-    <div class="container">
-      <hr style="background-color:#dbdbdb;height:1px">
-      <div style="float:right">
-        <span class="tag is-info is-rounded">
-          <b>Contact Us:&nbsp;&nbsp;</b><img src="./res/at-sign.png" width="128">
-        </span>
-      </div>
-    </div>
-  </footer-->
+  <div class="container has-text-centered">
+      <img src="./res/animated_ferris_white.gif">
+  </div>
 </body>
 
 </html>