feat: Add spacemacs module and update system

home/david/modules/programs/spacemacs/default.nix

@@ -0,0 +1,51 @@
+{
+  config,
+  pkgs,
+  lib,
+  inputs,
+  ...
+}:
+let
+  inherit (inputs) nixpkgs emacs-overlay spacemacs;
+  inherit (pkgs) system;
+  cfg = config.david.programs.spacemacs;
+  pkgs' = import nixpkgs {
+    inherit system;
+    overlays = [ emacs-overlay.overlays.default ];
+  };
+in
+{
+  options = {
+    david.programs.spacemacs = {
+      enable = lib.mkEnableOption "spacemacs";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    stylix.targets.emacs.enable = false;
+    xdg.configFile = {
+      emacs = {
+        source = "${spacemacs}";
+        recursive = true;
+      };
+    };
+    programs.emacs = {
+      enable = true;
+      package =
+        with pkgs';
+        (emacsPackagesFor emacs-pgtk).emacsWithPackages (epkgs: [
+          git
+          gnutar
+          ripgrep
+        ]);
+    };
+    services.emacs = {
+      client = {
+        enable = true;
+      };
+      defaultEditor = false;
+      enable = true;
+      socketActivation.enable = true;
+      startWithUserSession = true;
+    };
+  };
+}