updated nvim config, added local_ai

modules/core/nix.nix

@@ -1,18 +1,23 @@
 { ... }:
 
 {
-    nix = {
-        settings = {
-            experimental-features = [ "nix-command" "flakes" ];
-            auto-optimise-store = true;
-        };
-        
-        gc = {
-            automatic = true;
-            dates = "weekly";
-            options = "--delete-older-than 14d";
-        };
+  nix = {
+    settings = {
+      experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
+      auto-optimise-store = true;
+      substituters = [ "https://cache.nixos-cuda.org" ];
+      trusted-public-keys = [ "cache.nixos-cuda.org:74DUi4Ye579gUqzH4ziL9IyiJBlDpMRn9MBN8oNan9M=" ];
     };
-    
-    nixpkgs.config.allowUnfree = true;
+
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 14d";
+    };
+  };
+
+  nixpkgs.config.allowUnfree = true;
 }