Replace command-not-found with nix-index

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/fab09085df1b60d6a0870c8a89ce26d5a4a708c2' (2023-02-07)
  → 'github:NixOS/nixpkgs/724bfc0892363087709bd3a5a1666296759154b1' (2023-02-09)

configuration.nix

@@ -156,6 +156,13 @@ with pkgs;
   # Enable fish package completion
   programs.fish.enable = true;
 
+  # Enable nix-index
+  programs.command-not-found.enable = false;
+  programs.nix-index = {
+    enable = true;
+    enableFishIntegration = true;
+  };
+
   # Import other configuration modules
   imports = [
     ./modules/hardware-configuration.nix

flake.lock

@@ -61,11 +61,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1675763311,
-        "narHash": "sha256-bz0Q2H3mxsF1CUfk26Sl9Uzi8/HFjGFD/moZHz1HebU=",
+        "lastModified": 1675942811,
+        "narHash": "sha256-/v4Z9mJmADTpXrdIlAjFa1e+gkpIIROR670UVDQFwIw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fab09085df1b60d6a0870c8a89ce26d5a4a708c2",
+        "rev": "724bfc0892363087709bd3a5a1666296759154b1",
         "type": "github"
       },
       "original": {

flake.nix

@@ -23,9 +23,13 @@
       url = "github:robn/sasl2-oauth";
       flake = false;
     };
+    nix-index-database = {
+      url = "github:Mic92/nix-index-database";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, agenix, ... }@inputs:
+  outputs = { self, nixpkgs, agenix, nix-index-database, ... }@inputs:
     let
       system = "x86_64-linux";
 
@@ -36,7 +40,11 @@
     in {
       nixosConfigurations.panacea = lib.nixosSystem {
         inherit system;
-        modules = [ (import ./configuration.nix) agenix.nixosModules.age ];
+        modules = [
+          (import ./configuration.nix)
+          agenix.nixosModules.age
+          nix-index-database.nixosModules.nix-index
+        ];
         specialArgs = { inherit inputs; };
       };