Now that we've gotten enough of a sign-off
from everyone involved in the governance
process, the docs need to be reworked to use a
consistent terminology set, links, and directory
structure.
Rework of contributor docs to reflect actual flow
for both internal and external developers using
the PowerShell/PowerShell repo for the first time.
Includes updates to issue/PR guidelines, repo 101,
and CONTRIBUTING.md.
