Substitute out nix core settings

.config/nix/flake.lock

@@ -3,7 +3,7 @@
     "darwin": {
       "inputs": {
         "nixpkgs": [
-          "nixpkgs"
+          "nixpkgs-darwin"
         ]
       },
       "locked": {
@@ -23,7 +23,7 @@
     "home-manager": {
       "inputs": {
         "nixpkgs": [
-          "nixpkgs"
+          "nixpkgs-darwin"
         ]
       },
       "locked": {
@@ -43,16 +43,30 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1698931758,
-        "narHash": "sha256-pwl9xS9JFMXXR1lUP/QOqO9hiZKukEcVUU1A0DKQwi4=",
+        "lastModified": 1700977043,
+        "narHash": "sha256-tX4d36Bq75NBjnYGaCO9b403VDpdFa99NtdUPQ4EALk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "abbe047fb8a5a7074b6de24cced0dbdb27ea0ea8",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-darwin": {
+      "locked": {
+        "lastModified": 1701088922,
+        "narHash": "sha256-TZo37reWHGhII5hYtvBPsovQtd+I5XivUENhqQjNw3c=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b644d97bda6dae837d577e28383c10aa51e5e2d2",
+        "rev": "fa1c8834c9fe613fe3f84d6c524bb1779e50cd6e",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixpkgs-unstable",
+        "ref": "nixpkgs-23.11-darwin",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -61,7 +75,8 @@
       "inputs": {
         "darwin": "darwin",
         "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-darwin": "nixpkgs-darwin"
       }
     }
   },