feat: unify/update stockholm pkgs

configs/default.nix

@@ -30,13 +30,10 @@ in {
           };
         };
         overlays = [
+          (import <stockholm/krebs/5pkgs>)
           (self: super: {
             scripts = import <niveum/packages/scripts> { pkgs = super; lib = super.lib; };
           })
-          (import <stockholm/krebs/5pkgs/haskell>)
-          (import <stockholm/krebs/5pkgs/simple>)
-          (import <stockholm/submodules/nix-writers/pkgs>)
-          (import <stockholm/krebs/5pkgs/override>)
         ];
       };
     }

configs/flix.nix

@@ -55,7 +55,7 @@ in {
   };
 
   environment.systemPackages = [
-    (pkgs.writeDashBin "mpv-simpsons" ''
+    (pkgs.writers.writeDashBin "mpv-simpsons" ''
       set -efu
       cd "${flixLocation}/download"
       [ -f "${cacheLocation}/${indexFilename}" ] || exit 1
@@ -65,7 +65,7 @@ in {
         | shuf \
         | ${pkgs.findutils}/bin/xargs -d '\n' ${pkgs.mpv}/bin/mpv
     '')
-    (pkgs.writeDashBin "flixmenu" ''
+    (pkgs.writers.writeDashBin "flixmenu" ''
       set -efu
       cd "${flixLocation}/download"