doc: link to A Tour of Go

R=golang-dev, rsc, r
CC=golang-dev
https://golang.org/cl/5181045

doc/docs.html

@@ -16,6 +16,16 @@ Once you've learned a little about the language,
 idioms of programming in Go.
 </p>
 
+<h3 id="go_tour"><a href="http://go-tour.appspot.com/">A Tour of Go</a></h3>
+<p>
+An interactive introduction to Go in three sections.
+The first section covers basic syntax and data structures; the second discusses
+methods and interfaces; and the third introduces Go's concurrency primitives.
+Each section concludes with a few exercises so you can practice what you've
+learned. You can <a href="http://go-tour.appspot.com/">take the tour online</a> or
+<a href="http://code.google.com/p/go-tour/">install it locally</a>.
+</p>
+
 <h3 id="orig_tutorial"><a href="go_tutorial.html">A Tutorial for the Go Programming Language</a></h3>
 <p>
 The first tutorial. An introductory text that touches upon several core

doc/install.html

@@ -257,7 +257,8 @@ the process of building and testing Go programs.
 <h2 id="next">What's next</h2>
 
 <p>
-Start by reading the <a href="go_tutorial.html">Go Tutorial</a>.
+Start by taking <a href="http://code.google.com/p/go-tour/">A Tour of Go</a>
+or reading the <a href="go_tutorial.html">Go Tutorial</a>.
 </p>
 
 <p>

doc/root.html

@@ -49,10 +49,13 @@ google.setOnLoadCallback(loadFeed);
         It's a fast, statically typed, compiled language that feels like a 
         dynamically typed, interpreted language.
       </p>
-      <h2>Check it out!</h2>
+      <h2>
+        Get started now with
+	<a target="_blank" href="http://go-tour.appspot.com/">A Tour of Go</a>.
+      </h2>
       <p>
       <div class="how">[<a href="/doc/playground.html">How does this work?</a>]</div>
-      <a href="/doc/install.html">Install Go now</a>, or try it right here in your browser:</p>
+      Or try it right here in your browser:</p>
       <div id="playground" class="small"></div>
       <script src="/doc/play/playground.js"></script>
     </div>