docs remove video at the bottom

Author: chenglou

docs/index.md

@@ -82,13 +82,6 @@ id: home
   <script type="text/javascript" src="js/examples/markdown.js"></script>
 </section>
 <hr class="home-divider" />
-<section class="home-section home-presentation">
-  <h3>Presentation</h3>
-  <p>Watch this 30-minute presentation followed by a Q&A to learn more about React.</p>
-  <p><strong>Note:</strong> React was at 0.3.2 by the time of this talk and some APIs have changed since then.</p>
-  <figure><iframe width="650" height="400" src="//www.youtube.com/embed/XxVg_s8xAms" frameborder="0" allowfullscreen></iframe></figure>
-</section>
-<hr class="home-divider" />
 <section class="home-bottom-section">
   <div class="buttons-unit">
     <a href="docs/getting-started.html" class="button">Get Started</a>