fix(layout): move from docs to helix-ui

Author: Ryan A. Johnson

source/docs.less

@@ -13,7 +13,6 @@
   For distributed HelixUI CSS styles, see source/styles/helix-ui.less
 */
 @import 'vars';
-@import 'layout';
 
 @code-bg-color: @gray-900;
 

source/helix-ui.less

@@ -12,6 +12,7 @@
 @import  'reset';
 
 // Core CSS
+@import 'layout';
 @import 'scaffold';
 @import 'alert/alert';
 @import 'breadcrumb/breadcrumb';