Proposal: Restructure archetype layouts

[ryan-roemer]

Courtesy of @chaseadamsio

The idea is that ARCHETYPE/package.json has some warts from the scripts not really being for the archetype's dev / release workflow but for builder projects. This would formally split things to have a package.json that is only for developers of the archetype

Side note: If we're re-org-ing structure, probably worth discussing / consolidating builder init layout too.

/packages
-- archetype # this gets published as the archetype
---- package.json # and configs and stuff
-- archetype-dev  # this gets published as the archetype-dev
---- package.json # by itself
-- package.json # this is where we actually have the archetype lifecycle scripts

[kltan]

This is a great idea! Looking forward to auto (dev/non-dev) package.json sync.