added back stable branch, broken though because cerulean no support channel overrides

nixpkgs.nix

@@ -5,6 +5,15 @@
 } @ args: {
   nixpkgs.channels.default = rec {
     default = upkgs;
+
+    # nixpkgs
+    pkgs = {
+      inherit system;
+      source = inputs.nixpkgs;
+      overlays = [];
+      config.allowUnfree = true;
+    };
+
     # nixpkgs-unstable
     upkgs = {
       inherit system;
@@ -19,6 +28,7 @@
 
       config.allowUnfree = true;
     };
+
     # nixpkgs-staging
     spkgs = {
       inherit system;