Update 'configuration.nix'

configuration.nix

@@ -151,67 +151,5 @@ git
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "22.05"; # Did you read the comment?
 
-# code von hier https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/system/boot/tmp.nix :
-
-  with lib;
-
-let
-  cfg = config.boot;
-in
-{
-
-  ###### interface
-
-  options = {
-
-    boot.cleanTmpDir = mkOption {
-      type = types.bool;
-      default = true;
-      description = lib.mdDoc ''
-        Whether to delete all files in {file}`/tmp` during boot.
-      '';
-    };
-
-    boot.tmpOnTmpfs = mkOption {
-      type = types.bool;
-      default = true;
-      description = lib.mdDoc ''
-         Whether to mount a tmpfs on {file}`/tmp` during boot.
-      '';
-    };
-
-    boot.tmpOnTmpfsSize = mkOption {
-      type = types.oneOf [ types.str types.types.ints.positive ];
-      default = "50%";
-      description = lib.mdDoc ''
-        Size of tmpfs in percentage.
-        Percentage is defined by systemd.
-      '';
-    };
-
-  };
-
-  ###### implementation
-
-  config = {
-
-    # When changing remember to update /tmp mount in virtualisation/qemu-vm.nix
-    systemd.mounts = mkIf cfg.tmpOnTmpfs [
-      {
-        what = "tmpfs";
-        where = "/tmp";
-        type = "tmpfs";
-        mountConfig.Options = concatStringsSep "," [ "mode=1777"
-                                                     "strictatime"
-                                                     "rw"
-                                                     "nosuid"
-                                                     "nodev"
-                                                     "size=${toString cfg.tmpOnTmpfsSize}" ];
-      }
-    ];
-
-    systemd.tmpfiles.rules = optional config.boot.cleanTmpDir "D! /tmp 1777 root root";
-
-  };
 
 }