Add justifyContent to button (mirror-xyz#66)

* add justifyContent to button

* move justifyContent out of styles and into props

pass disabled prop down to box (mirror-xyz#65)

Button: Spread all pass-through BoxProps (mirror-xyz#64)

* spread button props

* add comment for clarity

add 68, 76 to space (mirror-xyz#63)

extend card options (mirror-xyz#62)

add onMouseEnter, onMouseLeave (mirror-xyz#61)

add Plug (mirror-xyz#60)

chore: add arrow down icon

add injected style system (mirror-xyz#58)

heading two line height (mirror-xyz#57)