Docs: Use the minified ratchet.css.

docs/_includes/header.html

@@ -11,7 +11,7 @@
 <!-- Roboto -->
 <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Roboto:400,500,700">
 
-<link rel="stylesheet" href="/dist/ratchet.css">
+<link rel="stylesheet" href="/dist/ratchet.min.css">
 <link rel="stylesheet" href="/assets/css/docs.css">
 <link rel="stylesheet" href="/assets/css/pygments.css">
 <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->