change css to min css

Author: Scrum

docs/_includes/header.html

@@ -4,4 +4,4 @@
 
 <link rel="stylesheet" href="{{ page.base_url }}assets/css/demo.css">
 <link rel="stylesheet" href="{{ page.base_url }}assets/css/pygments-manni.css">
-<link rel="stylesheet" href="{{ page.base_url }}dist/css/Slim.css">
+<link rel="stylesheet" href="{{ page.base_url }}dist/css/Slim.min.css">