remove unused files

middleware/error_handler.js

@@ -1,15 +0,0 @@
-const Helpers = require('../helpers');
-
-async function handler(err, req, res, next) {
-    if (res.headersSent) {
-        return next(err)
-    }
-    res.status(500).send(Helpers.ViewLoader.load('error.pug', {
-        error: '500 Internal Server Error',
-        message: 'An unexpected error happened in the server'
-    }));
-}
-
-module.exports = (router) => {
-    // router.use(handler);
-}