add i3 config

configuration.nix

@@ -67,12 +67,14 @@
 
   # xserver options
   services.xserver = {
-    displayManager.lightdm.enable = true;
+    displayManager = {
+      lightdm.enable = true;
+      defaultSession = "xfce+i3";
+    };
     enable = true;
     layout = "us";
     xkbVariant = "alt-intl";
     desktopManager = {
-      default = "xfce+i3";
       xterm.enable = false;
       xfce = {
         enable = true;

i3/settings.nix

@@ -1,7 +1,14 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
+let
+  mod = "Mod4";
+in
 {
   config = {
-    modifier = "Mod4";
+    modifier = mod;
+    keybindings = lib.mkOptionDefault {
+      "${mod}+d" = "rofi -combi-modi window,drun,ssh, -show-icons -show combi -modi combi";
+      "${mod}+Enter" = "kitty";
+    };
     startup = [
       { command = "i3-auto-layout"; always = true; }
     ];