Add the kustomize.io docsy template

site/layouts/404.html

@@ -0,0 +1,10 @@
+{{ define "main"}}
+    <main id="main">
+      <div>
+       <h1 id="title">Not found</h1>
+       <p>Oops! This page doesn't exist. Try going back to our <a href="{{ "/" | relURL }}">home page</a>.</p>
+
+       <p>You can learn how to make a 404 page like this in <a href="https://gohugo.io/templates/404/">Custom 404 Pages</a>.</p>      
+      </div>
+    </main>
+{{ end }}