Add a title to the Not Found page

Author: dunglas

src/containers/NotFound/NotFound.js

@@ -1,7 +1,10 @@
 import React from 'react';
+import Helmet from 'react-helmet';
 
 export default function NotFound() {
   return (
+    <Helmet title="Not Found"/>
+
     <div className="container">
       <h1>Doh! 404!</h1>
       <p>These are <em>not</em> the droids you are looking for!</p>