make "Go for it" link to install.html.

delete the unnecessary "Programming in Go. Watch Now" from the right box.
center the video picture in the right box.

R=rsc
CC=go-dev
http://go/go-review/1025027

doc/root.html

@@ -24,18 +24,13 @@
     </li>
   </ol>
 
-  <h1>Slow compiles?<br>Watch this.</h1>
-  <table>
+  <h1>Slow compiles?<br>Watch this</h1>
+  <table width="100%">
     <tr>
       <td align=center width="100%">
         <a href="http://www.youtube.com/FIXME"><img src="/doc/video-snap.jpg"></a>
       </td>
     </tr>
-    <tr>
-      <td align=center>
-        Programming with Go.<br><a href="http://www.youtube.com/FIXME">Watch now</a>.
-      </td>
-    </tr>
   </table>
 </div>
 
@@ -95,7 +90,7 @@ It's a joy to use.
 <h3>&hellip; open source</h3>
 
 <p>
-<a href="http://code.google.com/p/go/source/browse/">Go for it</a>.
+<a href="/doc/install.html">Go for it</a>.
 </p>
 
 </div>