feat: Added ollama for local machine

nixos/ryu/configuration.nix

@@ -52,8 +52,14 @@
       auto-optimise-store = true;
       extra-experimental-features = "nix-command flakes auto-allocate-uids";
       trusted-users = ["root" "servius"];
-      #substituters = ["https://sh.darksailor.dev"];
-      trusted-public-keys = ["mirai:bcVPoFGBZ0i7JAKMXIqLj2GY3CulLC4kP7rQyqes1RM="];
+      substituters = [
+        "https://nix-community.cachix.org"
+        # "https://sh.darksailor.dev"
+      ];
+      trusted-public-keys = [
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+        # "mirai:bcVPoFGBZ0i7JAKMXIqLj2GY3CulLC4kP7rQyqes1RM="
+      ];
     };
     extraOptions = ''
       build-users-group = nixbld
@@ -246,6 +252,7 @@
     # List packages installed in system profile. To search, run:
     # $ nix search wget
     systemPackages = with pkgs; [
+      nvtopPackages.nvidia
       quickemu
       (nixvim.makeNixvim (import ../../neovim))
       qpwgraph