system: use i3-gaps fork of i3

configuration.nix

@@ -150,7 +150,10 @@
     desktopManager.mate.enable = true;
     desktopManager.gnome.enable = true;
     desktopManager.gnome.flashback.enableMetacity = true;
-    windowManager.i3.enable = true;
+    windowManager.i3 = {
+      enable = true;
+      package = pkgs.i3-gaps;
+    };
   };
   programs.sway = {
     enable = true;

home/profiles/i3/default.nix

@@ -0,0 +1,7 @@
+{ config, pkgs, lib, ... }:
+
+{
+  xsession.windowManager.i3 = {
+    enable = true;
+  };
+}