Can you test a module from a local EspruinoDocs server

@Gordon

So it was a fairly easy fix to stop the CORS problem.

var express = require('express');
const cors = require('cors');
var app = express();
app.use(cors());

If i understand this properly this app.js is just testing. So if that's the case. I can push this simple fix and redirect anything that's trying to load a file from localhost:3040/modules to ~/workspace/espruinowebsite/www/modules