feat(keyboard): add enable option

modules/keyboard/default.nix

@@ -1,11 +1,19 @@
-{ pkgs, ... }:
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
 
-with pkgs;
 let
-  tools = interception-tools;
-  inherit (interception-tools-plugins) caps2esc;
+  cfg = config.keyboard;
+  tools = pkgs.interception-tools;
+  inherit (pkgs.interception-tools-plugins) caps2esc;
 in
 {
+  options.keyboard.enable = lib.mkEnableOption "keyboard remapping";
+
+  config = lib.mkIf cfg.enable {
     services.interception-tools = {
       enable = true;
       plugins = [ caps2esc ];
@@ -16,4 +24,5 @@ in
               EV_KEY: [KEY_CAPSLOCK]
       '';
     };
+  };
 }