Requirements

list all terminal keys (i.e. recursive search) in a JSON file
parse one JSON file and move the identified keys to new folder
if deleted keys leave behind an empty entry in the source JSON, delete it
parse entire folder and move identified keys to new folder

Stretch goals

make -i, --interactive mode with inquirer
tests
use a packager so we can split/import functions, use TS
allow user to reroot keys (i.e. not migrate unnecessary nesting)
if destination files exist, merge keys with existing, rather than overwriting