This change removes `rendered-scribblings' as a recognized "info.rkt"
definition (which was added for binary packages, but now `scribblings'
serves both roles).
The `raco setup' changes involve support for moving pre-rendered
documentation into place (where "moving" may actually mean
leaving it in place but updating the "local-redirect.js" path),
but also allowing documentation to be re-rendered.
70caf5f509