docs: reworking development setup (iteration=2)

Created by: jhchabran

This is a tracking issue so we can reference the work in https://docs.google.com/document/d/1nPGy6FOc8oFXhilGA7CuUu2MHlDHB4DuiXNs-mOADN8/edit#heading=h.lmtjnq53h6tl