feat: add nixos and hm config

nixcfgs/hosts/zephyrus/keyd.nix

@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    keyd
+  ];
+
+  services.keyd = {
+    enable = true;
+    keyboards = {
+      externalKeyboard = {
+        ids = [ "0b05:19b6:d167885d" ]; # ASUS Keyboard
+	settings = {
+	  main = {
+	    capslock = "overload(control, esc)";
+	  };
+	};
+      };
+    };
+  };
+}
+
+