Delete psc-package-nix.nix

nix/psc-package-nix.nix

-{ pkgs ? import ./pinned.nix { } }:
-
-pkgs.fetchFromGitHub {
-  owner = "justinwoo";
-  repo = "psc-package-nix";
-  rev = "0f1f001e2ea17ad461871a1873050f6aef5f1284";
-  sha256 = "1b59dddrkdvh0i26any5g7lxxaxnn9af61dhxbb9bdb5n831dviw";
-}