Some general improvements to the getting started guide

Procfile

@@ -1 +1 @@
-web: npm start
+web: node index.js

README.md

@@ -1,6 +1,6 @@
 # node-js-getting-started
 
-A barebones Node.js app using [Express 4](http://expressjs.com/).
+A barebones Node.js app using [Express](https://expressjs.com/).
 
 This application supports the [Getting Started on Heroku with Node.js](https://devcenter.heroku.com/articles/getting-started-with-nodejs) article - check it out.
 
@@ -15,7 +15,7 @@ $ npm install
 $ npm start
 ```
 
-Your app should now be running on [localhost:5001](http://localhost:5001/).
+Your app should now be running on [localhost:5006](http://localhost:5006/).
 
 ## Deploying to Heroku
 

index.js

@@ -1,11 +1,27 @@
 const express = require('express')
 const path = require('path')
 
-const PORT = process.env.PORT || 5001
-
-express()
-  .use(express.static(path.join(__dirname, 'public')))
-  .set('views', path.join(__dirname, 'views'))
-  .set('view engine', 'ejs')
-  .get('/', (req, res) => res.render('pages/index'))
-  .listen(PORT, () => console.log(`Listening on ${ PORT }`))
+const port = process.env.PORT || 5006
+
+const app = express()
+
+app.use(express.static(path.join(__dirname, 'public')))
+app.set('views', path.join(__dirname, 'views'))
+app.set('view engine', 'ejs')
+
+app.get('/', (req, res) => {
+  res.render('pages/index')
+})
+
+const server = app.listen(port, () => {
+  console.log(`Listening on ${port}`)
+})
+
+process.on('SIGTERM', async () => {
+  console.log('SIGTERM signal received: gracefully shutting down')
+  if (server) {
+    server.close(() => {
+      console.log('HTTP server closed')
+    })
+  }
+})