Remove docs and point to ones on dartlang.org.

app/views/index.mustache

 {{! Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
     for details. All rights reserved. Use of this source code is governed by a
     BSD-style license that can be found in the LICENSE file. }}
 
 <div class="intro">
   <h1>Welcome to pub.dartlang.org!</h1>
   <p>
     This is your friendly repository of packages of software for the
     <a href="http://dartlang.org">Dart programming language</a>. Explore
     packages here and install them using <strong>pub</strong>, the package
     manager for Dart.
   </p>
-  <a class="get-started" href="/doc">Get started</a>
+  <a class="get-started" href="https://www.dartlang.org/tools/pub/get-started.html">Get started</a>

[nweiz, 2014/02/14 02:57:12]

It would be nice to keep the line length below 80 characters where possible,
even in the mustache templates.

[Bob Nystrom, 2014/02/14 22:10:22]

Done.

 </div>
 <h2>Recently updated packages</h2>
 <table>
   <thead>
     <tr>
       <th>Package</th>
       <th>Version</th>
       <th>Description</th>
       <th width="100">Updated</th>
     </tr>
   </thead>
   <tbody>
     {{#recent_packages}}
       <tr>
         <th><a href="/packages/{{name}}">{{name}}</a></th>
         <td><span class="version">{{latest_version.version}}</span></td>
         <td>{{#description}}{{ellipsized_description}}{{/description}}</td>
         <td>{{short_updated}}</td>
       </tr>
     {{/recent_packages}}
   </tbody>
   <tfoot>
     <tr>
       <td colspan="4"><a href="/packages">More packages...</a></td>
     </tr>
   </tfoot>
 </table>