doc: move styles to style.css

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5685075

doc/go1.html

@@ -7,12 +7,6 @@
 -->
 
 
-<!-- Center the tables, and disable the 1995-era 3D borders -->
-<style type="text/css">
-table { margin-left: auto; margin-right: auto; border-style: none; }
-hr { border-style: none; border-top: 1px solid black; }
-</style>
-
 <h2 id="introduction">Introduction to Go 1</h2>
 
 <p>

doc/go1.tmpl

@@ -3,12 +3,6 @@
 }-->
 {{donotedit}}
 
-<!-- Center the tables, and disable the 1995-era 3D borders -->
-<style type="text/css">
-table { margin-left: auto; margin-right: auto; border-style: none; }
-hr { border-style: none; border-top: 1px solid black; }
-</style>
-
 <h2 id="introduction">Introduction to Go 1</h2>
 
 <p>

doc/style.css

@@ -328,3 +328,6 @@ body {
 .example .expanded { display: none; }
 .exampleVisible .collapsed { display: none; }
 .exampleVisible .expanded { display: block; }
+
+table.codetable { margin-left: auto; margin-right: auto; border-style: none; }
+hr { border-style: none; border-top: 1px solid black; }