message: flesh out the sandbox demo code a bit more
diff: /* eslint-disable import/no-namespace */
  import React from 'react'
  import {LiveEditor} from '@compositor/kit'
  +import {NavLink} from 'react-router-dom'
  import * as components from '../src'
  +Object.assign(components, {NavLink})
  +
  const code = `
  <Block p={4}>
  <Heading>Hello World!</Heading>
  - <Text>To get started with the Sandbox, start adding some primer-react components</Text>
  + <Text tag='p'>
  + All of the primer-react <NavLink to='/components'>components</NavLink> are available in this sandbox!
  + </Text>
  + <Box my={4} p={2}>
  + This is a box with <Text mono>some mono text</Text>.
  + </Box>
  </Block>`
  const Sandbox = () => <LiveEditor code={code} scope={components} />
  