refactor: es6 all the things!

routes/lessons.js

@@ -0,0 +1,14 @@
+const express = require('express')
+const router = express.Router()
+
+/* GET lessons listing. */
+router.get('/', function (req, res, next) {
+  res.render('lessons', { title: 'Lessons' })
+})
+
+/* GET lessons listing. */
+router.get('/:slug', function (req, res, next) {
+  res.render('lessons', { title: `Lesson with slug ${req.params.slug}` })
+})
+
+module.exports = router