CLI - init command about metalsmith HOT 1 OPEN

Second thoughts: scope is too broad. metalsmith init [--bare] [--json] <folder> will do and would set up a boilerplate with some essential core plugins like @metalsmith/layouts, @metalsmith/markdown, @metalsmith/permalinks and metalsmith-gzip and metalsmith-html-minifier, as well as some sane companion libraries like dotenv and prettier.

The --bare option would not add any plugins or content.
The --json option would output a metalsmith.json instead of a metalsmith.js.
The basic features to demonstrate are:

• loading env vars into metalsmith
• toggling the DEBUG env var
• switching between watch & single build modes
• defining common npm scripts

from metalsmith.