refactor: refactor routes

routes/sitemap.js

@@ -1,9 +1,5 @@
-const express = require('express')
-const router = express.Router()
-
 /* GET sitemap page. */
-router.get('/', function (req, res, next) {
+exports.getSitemap = async (req, res, next) => {
   res.render('sitemap', { title: 'Sitemap' })
-})
+}
 
-module.exports = router