Finally switch to flakes.

home-manager/sway/swayfx.nix

@@ -0,0 +1,14 @@
+{config, pkgs, ...}: {
+  # Enable Sway and write some scripts
+  wayland.windowManager.sway = {
+    package = pkgs.unstable.sway;
+    extraConfig = ''
+      # SwayFX specific options
+      blur enable
+      blur_passes 3
+      blur_radius 5
+      layer_effects 'rofi' blur enable
+      layer_effects 'notifications' blur enable; blur_ignore_transparent enable
+    '';
+  };
+}