Remove .html extension from links

chrome/common/extensions/docs/templates/articles/extensions_index.html

 <h1 id="What-are-extensions">What are extensions?</h1>
 
 <p>
   Extensions are small software programs that
   can modify and enhance the functionality of the Chrome browser.
   You write them using web technologies such as
   HTML, JavaScript, and CSS.
 </p>
 
 <p>
   <img src="{{static}}/images/index/gmail-small.png"
        width="91"
        height="35"
        align="right"
        style="margin-top:0px; margin-left:0.5em"
        alt="A screenshot of an extension's icon in the browser bar">
   Extensions have little to no user interface.
   For example, the image to the right shows the icon
   that provides the UI for the
-  <a href="samples.html#google-mail-checker">Google Mail Checker extension</a>.
+  <a href="samples#google-mail-checker">Google Mail Checker extension</a>.
 </p>
 
 <p>
   Extensions bundle all their files
   into a single file that the user downloads and installs.
   This bundling means that, unlike ordinary web apps,
   extensions don't need to depend
   on content from the web.
 </p>
 
 <p>
   You can distribute your extension
   using the
   <a href="https://chrome.google.com/webstore/developer/dashboard">Chrome Developer Dashboard</a>
   to publish to the
   <a href="http://chrome.google.com/webstore">Chrome Web Store</a>.
   For more information, see the
   <a href="http://code.google.com/chrome/webstore">store developer documentation</a>.
 </p>
 
 <h2 id="How-do-I-start">How do I start?</h2>
 <ol>
   <li>
-    Follow the <a href="getstarted.html">Getting Started tutorial</a>
+    Follow the <a href="getstarted">Getting Started tutorial</a>
   </li>
   <li>
     Read the
-    <a href="overview.html">Overview</a>
+    <a href="overview">Overview</a>
   </li>
   <li>
     Keep up-to-date by reading the
     <a href="http://blog.chromium.org/">Chromium blog</a>
   </li>
   <li>
     Subscribe to the
     <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions">chromium-extensions group</a>
   </li>
 </ol>
 
 <h2 id="Featured-videos">Featured videos</h2>
 
 <p>
   <a href="http://www.youtube.com/view_play_list?p=CA101D6A85FE9D4B">Technical videos</a> <br>
   <a href="http://www.youtube.com/view_play_list?p=38DF05697DE372B1">Developer snapshots</a> (below)
 </p>
 
 <p>
   <iframe title="YouTube video player" width="300" height="199" src="//www.youtube.com/embed/wRDPTnY3yO8?rel=0" frameborder="0" allowfullscreen=""></iframe>
 </p>