message: simplify SideNav
diff: @@ -5,8 +5,7 @@ import {Box} from '../../src'
  export default function SideNav({basename, title, examples, ...rest}) {
  return (
  - <Box {...rest}>
  - <nav className="menu">
  + <Box is="nav" className="menu" {...rest}>
  <NavLink to={basename} className="menu-heading no-underline link-gray-dark">
  {title}
  </NavLink>
  @@ -20,7 +19,6 @@ export default function SideNav({basename, title, examples, ...rest}) {
  {example.name}
  </NavLink>
  ))}
  - </nav>
  </Box>
  )
  }
  