Move css/*.css to assets/css/*.css

See discussion on #25 for reorganising the site assets
like css and images.

Author: peterjc

Diff for: _includes/head.html

@@ -16,9 +16,9 @@
   </title>
 
   <!-- CSS -->
-  <link rel="stylesheet" href="{{ site.baseurl }}css/poole.css">
-  <link rel="stylesheet" href="{{ site.baseurl }}css/syntax.css">
-  <link rel="stylesheet" href="{{ site.baseurl }}css/hyde.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}assets/css/poole.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}assets/css/syntax.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}assets/css/hyde.css">
   <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700%7CAbril+Fatface">
 
   <!-- Icons -->