https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/x11/display-managers/sddm.nix
https://wiki.hyprland.org/Nix/
    https://nixos.wiki/wiki/Hyprland

2023
Vimjoyer - NixOS: Sddm, Gtk, QT5 Simple Theming Guide of 8:16
    https://www.youtube.com/watch?v=m_6eqpKrtxk
    https://github.com/vimjoyer/theming-video/blob/main/README.md
    ! both gtk and qt theming

    # home.nix
    gtk.enable = true;
    qt.enable = true;

with wayland
https://github.com/NixOS/nixpkgs/issues/252577
    https://github.com/NixOS/nixpkgs/pull/242009
xserver refactoring
    https://github.com/NixOS/nixpkgs/issues/94799
with hyprland
    https://wiki.hyprland.org/0.20.1beta/Getting-Started/Installation/
    https://github.com/sddm/sddm/issues/1476

https://search.nixos.org/options?channel=23.11&type=packages&query=hyprland
https://search.nixos.org/options?channel=23.11&type=packages&query=sddm

qa
https://www.linux.org.ru/forum/desktop/17089688?lastmod=1674376550849
    services.xserver.displayManager.sddm.enable = true;
    services.xserver.displayManager.defaultSession = "sddm";