Move CJS build to to root

[benmvp]

🚀 Feature Proposal

Instead of putting the CJS build at lib/cjs, put it at lib/ so that it'll be at the root of the package. The esm/ folder will remain.

Motivation

This allows the package to do deep importing without having to reference the cjs/ folder.

Example

We want this:

import { getValue } from 'my-lib/getters'

Instead of:

import { getValue } from 'my-lib/cjs/getters'