add more resources links

Author: belen-albeza

gallery.html

@@ -30,8 +30,10 @@ <h2>Index</h2>
         </dl></nav>
         <h2>Resources</h2>
         <nav><ul>
-            <li><a href="https://developer.mozilla.org/en/docs/Web/API/Animation" target="_blank">Web Animations at the MDN</a> (API reference)</li>
+            <li><a href="https://developer.mozilla.org/en/docs/Web/API/Animation" target="_blank">Web Animations at the MDN</a> (API reference) and
+                <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Animations_API/Using_the_Web_Animations_API" target="_blank">tutorial</a>.</li>
             <li><a href="http://web-animations.github.io/web-animations-demos/" target="_blank">Web animation demos</a> (more animation examples)</li>
+            <li><a href="http://codepen.io/collection/bpEza/" target="_blank"><i>"Alice in Web Animation Land"</i></a> demos</li>
         </ul></nav>
     </main>
 <script>