old_contents: var express = require('express')
    , app = express();
  
  app.get('/', function(req, res){
  	res.send('<h1>Hello World</h1>');
  });
  
  app.listen(8000);
  
new_contents: var express = require('express')
    , app = express();
  
  app.use(express.static(__dirname + '/public'));
  
  app.get('/', function(req, res){
  	res.sendFile('index.html');
  });
  
  app.listen(8000);
  
subject: update express to serve public/index.html