Use .npmrc instead of json config

[stcherenkov]

ufs-react-doc/src/scripts/init.ts

Lines 25 to 30 in ad0a734

	{
	type: 'input',
	name: 'npmRegistry',
	message: 'Set npm registry path',
	default: 'https://registry.npmjs.org/'
	}

The case is too narrow, you could specify link to npm registry root change in docs.

Also this functionality is handled by local .npmrc file, please consider creating and adding rule to it instead of custom json config.