build: Prepare hslayers-app for publishing
build: Prepare hslayers-app for publishing

This copies README, package.json from projects/hslayers-app directory,
builds sourcemaps and disables chunk hashing as prerequisites
for publishing hslayers app to npm.

hslayers/hslayers-ng,hslayers/hslayers-ng,hslayers/hslayers-ng,hslayers/hslayers-ng