Remove deprecated protonup-ng and add missing proton-ge-bin compatibility

- Removed `protonup-ng` from home-manager configuration for games, as it is no longer used.
- Added `unstable.proton-ge-bin` to Steam's compatibility packages in the NixOS user configuration.

home-manager/sajenim/features/games/default.nix

@@ -6,7 +6,6 @@
   home = {
     packages = with pkgs; [
       gamemode
-      protonup-ng
       prismlauncher
       unstable.bolt-launcher
     ];