Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

layouts/docs/search.html

@@ -0,0 +1,25 @@
+{{ define "content" }}
+<h1>{{ .Title }}</h1>
+<script type="text/javascript">
+  document.write('<gcse:searchresults-only linktarget="_parent"></gcse:searchresults-only>');
+</script>
+
+<script>
+  (function() {
+    var cx = '013288817511911618469:elfqqbqldzg';
+    var gcse = document.createElement('script');
+    gcse.type = 'text/javascript';
+    gcse.async = true;
+    gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
+        '//cse.google.com/cse.js?cx=' + cx;
+    var s = document.getElementsByTagName('script')[0];
+    s.parentNode.insertBefore(gcse, s);
+
+    document.querySelector('html').classList.add('search');
+  })();
+</script>
+{{ end }}
+
+
+
+