doc: drop video title from homepage

It's just stutter.

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/6334053

doc/root.html

@@ -68,7 +68,6 @@ Linux, Mac OS X, Windows, and more.
 
 <div id="video">
 <div class="rootHeading">Featured video</div>
-<a class="title" href="http://www.youtube.com/watch?v=ytEkHepK08c">A Tour of Go</a>
 <iframe width="415" height="241" src="http://www.youtube.com/embed/ytEkHepK08c" frameborder="0" allowfullscreen></iframe>
 </div>