feat(skadi): add emacs overlay/config.

modules/linux/home-manager/emacs.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  options = {
+    crony.emacs.enable = lib.mkEnableOption "Enable and setup emacs";
+  };
+
+  config = lib.mkIf config.crony.emacs.enable {
+    # Disable emacs stylix target
+    stylix.targets.emacs.enable = false;
+
+    # Setup emacs
+    programs.emacs = {
+      enable = true;
+      package = pkgs.emacsWithPackagesFromUsePackage {
+        package = pkgs.emacs-git;
+        config = ./configs/emacs/config.org;
+        extraEmacsPackages = epkgs: [
+          epkgs.use-package
+        ];
+        defaultInitFile = true;
+        alwaysEnsure = true;
+        alwaysTangle = true;
+      };
+    };
+  };
+}