app.js

const path = require('path');                             # new
const express = require('express');                       # new
const bodyParser = require('body-parser');

app.set('views', __dirname + '/views');
app.set('view engine', 'twig');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use(express.static(path.join(__dirname, 'public')));  # new

require('./routes');