Fix relative urls

_layouts/default.html

@@ -5,7 +5,7 @@
     <meta http-equiv="X-UA-Compatible" content="chrome=1">
     <title>{% if page.title %}{{ page.title}} | {% endif %}{{ site.title | default: site.github.repository_name }}</title>
 
-    <link rel="stylesheet" href="{{ '{{ assets/css/style.css | relative_url }}?v=' | append: site.github.build_revision | relative_url }}">
+    <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
     <link rel="shortcut icon" type="image/svg+xml" href="{{ /favicon.svg | relative_url }}" sizes="any">
     <link rel="icon" type="image/png" href="{{ /favicon.png | relative_url }}" sizes="32x32">
     <link rel="apple-touch-icon" href="{{ /apple-touch-icon.png | relative_url }}" sizes="180x180">