feat(keyd): setup keyd and some keybindings.

modules/linux/nixos/keyd.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  options = {
+    crony.keyd.enable = lib.mkEnableOption "Enable and setup keyd layers";
+  };
+
+  config = lib.mkIf config.crony.keyd.enable {
+    services.keyd = {
+      enable = true;
+      keyboards.default = {
+        ids = ["*"];
+        settings = {
+          main = {
+            capslock = "overload(control, esc)";
+            esc = "capslock";
+          };
+        };
+      };
+    };
+  };
+}