Remove ads from 404 page.

Change-Id: I5f5f643c409dfed02a4e44ce7dd33fe6e4d8f2da
diff --git a/_layouts/404.html b/_layouts/404.html
new file mode 100644
index 0000000..704c257
--- /dev/null
+++ b/_layouts/404.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+
+  {% include head.html %}
+
+  <body>
+
+    {% include header404.html %}
+
+    <div class="page-content">
+      <div class="wrapper">
+        {{ content }}
+      </div>
+    </div>
+
+    {% include footer404.html %}
+
+  </body>
+
+</html>