Opinions - bin/www

[tyeung2017]

I know it is generated from express-generator and lots of ppl just use it without questions

Below is only my personal preference:

1. prefer declaring functions at the top rather than bottom of the page as the reader would need to look all over your file to find the functions

2. some of the config there is overkilled, like normalisePorts; since you are controlling the env variable for port, it is kind of redundant; less is more

https://stackoverflow.com/questions/47276081/expressjs-normalizeport-function-is-really-necessary