Use hugo-wrapper for demo target of exampleSite (#74)

Khosrow Moossavi

10.32.2018 ce21f192aa0f126cb8507ee0ef539b9ecea11c01

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<section class="container centered">
  <div class="error">
    <h1>404</h1>
    <h2>Page Not Found</h2>
    <p>Sorry, this page does not exist.<br />You can head back to <a href="{{ .Site.BaseURL }}">homepage</a>.</p>
  </div>
</section>