Navigation component

Horizontal, unmodified `.nav`

Vertical `.nav .nav--vertical`

Horizontal, left toggler `.nav .nav--toggler-left`

Horizontal, right toggler `.nav .nav--toggler-right`

Vertical, left toggler `.nav .nav--vertical .nav--toggler-left`

Vertical, right toggler `.nav .nav--vertical .nav--toggler-right`

Vertical w/o nav__identity `.nav .nav--vertical .nav--toggler-left`

Vertical w/o nav__identity `.nav .nav--vertical .nav--toggler-right`

Sliding, west-facing
`.nav .nav--sliding .nav--toggler-left`

Sliding, east-facing
`.nav .nav--sliding .nav--toggler-right`