Build Espruino with user code

Thank you Gordon.

I will take a look at the npm repo.

Heck I wish I knew the last part last year. We deployed 25 or so Pucks, never occurred to me to just read back the flash... Used to lock bits back in my AVR days, where that was near impossible.

Thank you. Now on to the next task of getting this RAK8212 to function properly. Wanted to make sure I could be production ready before ending knee deep in trying to program 1000's of these. Cheers.