Use coffeescript.org instead of github link.

docs/client/packages/coffeescript.html

@@ -2,13 +2,13 @@
 {{#better_markdown}}
 ## `coffeescript`
 
-[CoffeeScript](http://jashkenas.github.com/coffee-script/) is a little language that compiles into JavaScript. It
-provides a simple syntax without lots of braces and parentheses.  The
-code compiles one-to-one into the equivalent JS, and there is no
-interpretation at runtime.
+[CoffeeScript](http://coffeescript.org/) is a little language that
+compiles into JavaScript. It provides a simple syntax without lots of
+braces and parentheses.  The code compiles one-to-one into the
+equivalent JS, and there is no interpretation at runtime.
 
 CoffeeScript is supported on both the client and the server. Files
-ending with `.coffee` or `.litcoffee` are automatically compiled to 
+ending with `.coffee` or `.litcoffee` are automatically compiled to
 JavaScript.
 
 {{/better_markdown}}