- Updated linked images to have obvious focus styles
- Added proper role to notifications
- Made dropdown list focus styles a bit nicer.
- Updated book list chapter child slide down to be keyboard activatable.
Related to #1320
- Removed all existing SCSS usage of primary color.
- Cut down custom styles injection to just be css vars.
- Reduced button styles so default button is primary.
- Updated button styles to lighten/brighten on hover & active states even
when a custom color is set.
- Removed unused scss color vars.
- Updated default BookStack blue to achieve better accessibility.
Since the old library was GPLv3 i changed the color picker to tiny-color-picker which is MIT.
Also extracted the styles to a shared view and move color calculation logic to javascript side.
