nixos/rootston: Remove the module and the package (#48905)

Rootston is just a reference compositor so it doesn't make that much
sense to have a module for it. Upstream doesn't really like it as well:

"Rootston will never be intended for downstream packages, it's an
internal thing we use for testing." - SirCmpwn [0]

Removing the package and the module shouldn't cause much problems
because it was marked as broken until
886131c243. If required the package can
still be accessed via wlroots.bin (could be useful for testing
purposes).

[0]: https://github.com/NixOS/nixpkgs/issues/38344#issuecomment-378449256

nixos/modules/module-list.nix

@@ -108,7 +108,6 @@
   ./programs/oblogout.nix
   ./programs/plotinus.nix
   ./programs/qt5ct.nix
-  ./programs/rootston.nix
   ./programs/screen.nix
   ./programs/sedutil.nix
   ./programs/slock.nix

nixos/modules/programs/rootston.nix

@@ -1,103 +0,0 @@
-{ config, pkgs, lib, ... }:
-
-with lib;
-
-let
-  cfg = config.programs.rootston;
-
-  rootstonWrapped = pkgs.writeScriptBin "rootston" ''
-    #! ${pkgs.runtimeShell}
-    if [[ "$#" -ge 1 ]]; then
-      exec ${pkgs.rootston}/bin/rootston "$@"
-    else
-      ${cfg.extraSessionCommands}
-      exec ${pkgs.rootston}/bin/rootston -C ${cfg.configFile}
-    fi
-  '';
-in {
-  options.programs.rootston = {
-    enable = mkEnableOption ''
-      rootston, the reference compositor for wlroots. The purpose of rootston
-      is to test and demonstrate the features of wlroots (if you want a real
-      Wayland compositor you should e.g. use Sway instead). You can manually
-      start the compositor by running "rootston" from a terminal'';
-
-    extraSessionCommands = mkOption {
-      type = types.lines;
-      default = "";
-      example = ''
-        # Define a keymap (US QWERTY is the default)
-        export XKB_DEFAULT_LAYOUT=de,us
-        export XKB_DEFAULT_VARIANT=nodeadkeys
-        export XKB_DEFAULT_OPTIONS=grp:alt_shift_toggle,caps:escape
-      '';
-      description = ''
-        Shell commands executed just before rootston is started.
-      '';
-    };
-
-    extraPackages = mkOption {
-      type = with types; listOf package;
-      default = with pkgs; [
-        westonLite xwayland rofi
-      ];
-      defaultText = literalExample ''
-        with pkgs; [
-          westonLite xwayland rofi
-        ]
-      '';
-      example = literalExample "[ ]";
-      description = ''
-        Extra packages to be installed system wide.
-      '';
-    };
-
-    config = mkOption {
-      type = types.str;
-      default = ''
-        [keyboard]
-        meta-key = Logo
-
-        # Sway/i3 like Keybindings
-        # Maps key combinations with commands to execute
-        # Commands include:
-        # - "exit" to stop the compositor
-        # - "exec" to execute a shell command
-        # - "close" to close the current view
-        # - "next_window" to cycle through windows
-        [bindings]
-        Logo+Shift+e = exit
-        Logo+q = close
-        Logo+m = maximize
-        Alt+Tab = next_window
-        Logo+Return = exec weston-terminal
-        Logo+d = exec rofi -show run
-      '';
-      description = ''
-        Default configuration for rootston (used when called without any
-        parameters).
-      '';
-    };
-
-    configFile = mkOption {
-      type = types.path;
-      default = "/etc/rootston.ini";
-      example = literalExample "${pkgs.rootston}/etc/rootston.ini";
-      description = ''
-        Path to the default rootston configuration file (the "config" option
-        will have no effect if you change the path).
-      '';
-    };
-  };
-
-  config = mkIf cfg.enable {
-    environment.etc."rootston.ini".text = cfg.config;
-    environment.systemPackages = [ rootstonWrapped ] ++ cfg.extraPackages;
-
-    hardware.opengl.enable = mkDefault true;
-    fonts.enableDefaultFonts = mkDefault true;
-    programs.dconf.enable = mkDefault true;
-  };
-
-  meta.maintainers = with lib.maintainers; [ primeos gnidorah ];
-}

pkgs/top-level/all-packages.nix

@@ -17197,7 +17197,7 @@ with pkgs;
 
   wlc = callPackage ../development/libraries/wlc { };
   wlroots = callPackage ../development/libraries/wlroots { };
-  rootston = wlroots.bin;
+
   orbment = callPackage ../applications/window-managers/orbment { };
 
   sway = callPackage ../applications/window-managers/sway { };