add a copy of the sample image to the theme

Bud Parr

19.20.2017 8c101b42318784005441b466c31561b527fc6813

 layouts/partials/site-header.html

@@ -1,5 +1,5 @@
{{ if .Params.featured_image }}
  <header class="cover bg-center" style="background-image: url('{{ .Params.featured_image  | absURL }}');">
  <header class="cover bg-center" style="background-image: url('{{ .Params.featured_image | absURL }}');">
    <div class="bg-black-60">
      {{ partial "site-navigation.html" .}}
      <div class="tc-l pv4 pv6-l ph3 ph4-ns">