* rewrite it in a single, more standard makefile
* forward most commands to npm
* support parallel use
* get rid of load-time auth check and trust user
* rework targets
* `prep_commit` -> `format`, `lint`
* `dev`, `beta`, `release` -> `build-dev`, `build-prod`, `build-tests`
* `prep_staging`, `package`: rm
* update devguide accordingly
Fixes: #1401