Changed 404.md to 404.html.twig

source/404.html.twig

@@ -0,0 +1,14 @@
+---
+layout: default
+title: Page Not Found
+permalink: /404.html
+---
+{% block content_wrapper %}
+  <div class="col-md-12">
+    {% block content %}
+      <h1>Page Not Found</h1>
+    {% endblock %}
+  </div> {# .col.md-12 #}
+{% endblock %}
+
+{% block sidebar %}{% endblock %}

source/404.md

@@ -1,6 +0,0 @@
----
-layout: default
-title: Page Not Found
-permalink: /404.html
----
-# Page Not Found