Add a NotFoundView story for testing

src/stories/views/Navigation/NotFoundView.stories.js

+import React from "react";
+import { AppHarness } from "../../../mocks/AppHarness";
+import NotFoundView from "../../../components/navigation/NotFoundView";
+
+export default {
+  title: "Views/Navigation/NotFoundView"
+};
+
+const Template = () => (
+  <AppHarness>
+    <NotFoundView />
+  </AppHarness>
+);
+
+export const Default = () => <Template />;