Refactored layout styles:

1. Now iPad vertical gets a collapsed sidebar with columns
2. Moved sidebar toggler styles from layout to sidebar/base
3. Added body class .sidebar-footer to support an always collapsed sidebar
4. Added $indented-lists (bool) for easily setting list indent preferences
5. Removed no-sidebar checking from sidebar-toggler, handled it through css.

.themes/classic/sass/custom/_layout.scss

@@ -2,6 +2,7 @@
 // To give it a try, uncomment some of the lines below, make changes, rebuild your blog, and see how it works.
 
 //$max-width: 1350px;
+//$indented-lists: true;
 
 // Padding used for layout margins
 //$pad-min: 18px;