Use express's built in static middleware to serve static files

[giodamelio]

It is a bit safer to let express handle the static files. I also moved the static files into their own directory to keep anyone from requesting any other files.

[alexandrevicenzi]

index.html need to be moved to /static too, I think. Could you fix this?

[giodamelio]

Isn't index.html an example?

[alexandrevicenzi]

Well, it will be my main page, for now it's just an example. But if I try to access / it will break, because now files are at /static.

[giodamelio]

Ahh, I get it. One sec.

[giodamelio]

There you go.

[alexandrevicenzi]

Thanks.