update demo

Author: Ivan Demidov

docs/_includes/header.html

@@ -2,6 +2,6 @@
 
 <title>{{ page.title }}</title>
 
-<link rel="stylesheet" href="assets/css/demo.css">
-<link rel="stylesheet" href="assets/css/pygments-manni.css">
-<link rel="stylesheet" href="dist/css/slim-grid.css">
+<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-grid.css">

docs/index.html

@@ -3,7 +3,6 @@
 title: slim-grid
 slug: slim-grid
 lead: "A simple slim-grid"
-base_url: "../"
 ---
 
 <div class="sl-col-6 demo-space">