upgrade to nixos 25.11

- thefuck has been removed, use pay-repects instead
- 'glxinfo' has been renamed to/replaced by 'mesa-demos'
- options have been moved out of the 'xserver' namespace
- use default mesa drivers, remove amdvlk
- systemd global config has been moved and is not string-based anymore
- git settings have been moved to sub-attrset
- ssh default options generate a warning now but are not needed -> disable
- unpin nixpkgs version for servicepoint flakes

nixosModules/amd-graphics.nix

@@ -7,11 +7,6 @@
     graphics.enable = true;
     amdgpu = {
       opencl.enable = true;
-      amdvlk = {
-        # TODO: this creates black borders around GNOME apps
-        # enable = true;
-        # support32Bit.enable = config.hardware.graphics.enable32Bit;
-      };
       overdrive.enable = true;
     };
   };