Use our error page for 404s

Otherwise non existent routes fall back to the default express 404

controllers/error404.js

@@ -0,0 +1,5 @@
+module.exports = (req, res) => {
+  const statusCode = 404;
+  const error = '404 Not Found';
+  res.status(statusCode).render('error.html', { error });
+};

controllers/index.js

@@ -3,5 +3,6 @@ module.exports = {
   node:         require('./node'),
   about:        require('./about'),
   noConnection: require('./no-connection'),
-  error:        require('./error')
+  error:        require('./error'),
+  error404:     require('./error404')
 };

index.js

@@ -39,6 +39,7 @@ app.use('/sw.js', express.static(`${__dirname}/public/sw.js`, { maxAge: '1 hour'
 app.use(express.static(`${__dirname}/public`, { maxAge: '1 year' }));
 
 // Errors
+app.use(controllers.error404);
 app.use(controllers.error);
 
 // Start app