nix: moved y-combinator wallpaper to its own project/input

nix/packages/default.nix

@@ -2,14 +2,10 @@
   self,
   lib,
   inputs,
-
-  withSystem,
   ...
 }:
 
 {
-  imports = [ inputs.flakies.flakeModules.typstLib ];
-
   flake.lib.mkNerdFont = ./mkNerdFont.nix;
 
   flake.overlays.packages =
@@ -77,25 +73,6 @@
       ffgun = final.callPackage ./ffgun.nix { };
       easyscan = final.callPackage ./easyscan.nix { };
 
-      y-combinator-wallpaper = withSystem final.system (
-        { typstLib, ... }:
-        typstLib.typstDerivation.overrideAttrs {
-          src = ./y-combinator-wallpaper;
-          dontFixup = true; # no need to patch the pdf
-          buildPhase = ''
-            runHook preBuild
-            typst compile main.typ main.svg
-            runHook postBuild
-          '';
-          installPhase = ''
-            runHook preInstall
-            mkdir -p "$out"
-            cp main.svg "$out/"
-            runHook postInstall
-          '';
-        }
-      );
-
       # Unmerged packages from nixfinal
       # TODO: use upstream when merged
       dl-librescore = final.callPackage ./dl-librescore.nix { };