home: move emacs service to home config

home/emacs.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+{
+  options.my.home.emacs = with lib; {
+    enable = mkEnableOption "Emacs daemon configuration";
+  };
+
+  config = lib.mkIf config.my.home.emacs.enable {
+    services.emacs = {
+      enable = true;
+      # generate emacsclient desktop file
+      client.enable = true;
+    };
+
+    programs.emacs = {
+      enable = true;
+      package = pkgs.emacsPgtkGcc;
+    };
+  };
+}