next.js/examples/gh-pages/pages/about.js

import Link from 'next/link'
export default () => (
  <div>
    <div>About us</div>
    <div>
      Back to{' '}
      <Link href='/' as={process.env.BACKEND_URL + '/'}>
        <a>Home</a>
      </Link>
    </div>
  </div>
)