Prior to this change, DAO setup instructions and information were
interspersed within dev-setup.md, making it confusing to the uninitiated
reader what they need to do in order to get up and running with a basic
local dev environment. All the DAO setup stuff is essentially optional,
so separating it out into its own doc makes sense.
Now, dev-setup.md is dedicated to the task of getting set up with a
self-contained local development environment, and readers can follow the
DAO setup instructions separately if and when they need to.
Both docs need to be further revised and cleaned up, but that will come
in subsequent commits.