Put all rhyolite packages in the shell

[madeline-os]

This means that when you drop into nix-shell -A proj.shells.ghc, cabal will build all of the local packages that are dependencies you have, instead of them being built as part of entering the nix-shell. This is somewhat painful in that more building happens than needed for most dependencies, but the previous approach led to being unable to enter a nix-shell if there was a broken package.