Add web server for Heroku

Procfile

@@ -1 +1,2 @@
 renovate: node renovate
+web: node bin/heroku/web.js

bin/heroku/web.js

@@ -0,0 +1,18 @@
+/* eslint-disable no-console */
+const http = require('http');
+
+const port = process.env.PORT || '3000';
+
+const requestHandler = (request, response) => {
+  // Redirect users to Heroku dashboard
+  response.writeHead(302, { Location: 'https://dashboard.heroku.com/apps' });
+  response.end();
+};
+
+http.createServer(requestHandler).listen(port, (err) => {
+  if (err) {
+    console.log('Failed to start web server', err);
+    return;
+  }
+  console.log(`Web server is listening on ${port}`);
+});