begin migration to dendritic pattern

old-config/modules/display-managers/gdm.nix

@@ -0,0 +1,7 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.displayManager.gdm.enable = true;
+}

old-config/modules/display-managers/lightdm.nix

@@ -0,0 +1,11 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.xserver.enable = true;
+  services.xserver.displayManager.lightdm = {
+    enable = true;
+    greeters.gtk.enable = true;
+  };
+}

old-config/modules/display-managers/ly.nix

@@ -0,0 +1,11 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.displayManager.ly = {
+    enable = true;
+  };
+
+  security.pam.services.login.fprintAuth = false;
+}

old-config/modules/display-managers/sddm.nix

@@ -0,0 +1,21 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.displayManager = {
+    autoLogin = {
+      enable = true;
+      user = "grey";
+    };
+
+    sddm = {
+      enable = true;
+      wayland.enable = true;
+      enableHidpi = true;
+      autoNumlock = true;
+      
+      autoLogin.relogin = true;
+    };
+  };
+}