Describe hover, focus and active states for primary and secondary
buttons.
Organized the icons section in a table. Replaced images for icons
so they are all the same size.
Organized the color section in a table. Replaced the images with
new ones so the table would have a more manageable size. Updated
the values for some colors to show the $color-light shade.
Remove commented sections
Remove `db/schema.rb`
Add db/schema.rb from origin/master
Fix typos
