move doc building into base make method + build bootstrap to doc assets

docs/javascript.html

@@ -13,8 +13,8 @@
     <![endif]-->
 
     <!-- Le styles -->
-    <link href="../bootstrap.css" rel="stylesheet">
-    <link href="../bootstrap-responsive.css" rel="stylesheet">
+    <link href="assets/css/bootstrap.css" rel="stylesheet">
+    <link href="assets/css/bootstrap-responsive.css" rel="stylesheet">
     <link href="assets/css/docs.css" rel="stylesheet">
     <link href="assets/js/google-code-prettify/prettify.css" rel="stylesheet">