lib/godoc/codewalk.html: remove duplicate jquery inclusion

now we load jquery in its parent--godoc.html.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6814112

lib/godoc/codewalk.html

@@ -4,8 +4,6 @@
 	license that can be found in the LICENSE file.
 -->
 
-<script src="http://www.google.com/jsapi"></script>
-<script>google.load("jquery", "1.3.2");</script>
 <style type='text/css'>@import "/doc/codewalk/codewalk.css";</style>
 <script type="text/javascript" src="/doc/codewalk/codewalk.js"></script>