This chagne instroduces following variables
that allows authors to customize a font family for each class.
- $serif
- $sans
- $heading-font-family
- $header-title-font-family
This change also adds anotehr custom scss file named "_fonts.scss".
We can use it to override these newly introduced variables.
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.
