message: add dynamic version to index hero
diff: import React from 'react'
  import {Box, Heading, Text} from '../..'
  import IndexImage from './IndexImage.svg'
  +import {version} from '../../package.json'
  +
  const IndexHero = () => (
  <Box bg="black">
  @@ -10,7 +12,7 @@ const IndexHero = () => (
  Primer Components
  </Heading>
  <Text color="blue.2" fontSize={2} fontWeight={400} className="text-mono">
  - v2.0.4-beta
  + v{version}
  </Text>
  </Box>
  <Box mb={6}>
  