Add a link in the home to the Gruntfile sample

Closes gruntjs#134

src/tmpl/index.jade

@@ -15,7 +15,7 @@ block content
 
           .why.left
             h2 Why use a task runner?
-            p In one word: automation. The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it, a task runner can do most of that mundane work for you—and your team—with basically zero effort.
+            p In one word: automation. The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it through a <a href="/sample-gruntfile">Gruntfile</a>, a task runner can do most of that mundane work for you—and your team—with basically zero effort.
 
           .why.right
             h2 Why use Grunt?