emulsion-palette: remove package

It is now upstreamed into nixpkgs. Hoorah!

pkgs/default.nix

@@ -16,7 +16,6 @@ let
       freerct = callPackage ./freerct.nix { };
       distant = callPackage ./distant.nix { };
       doggo = callPackage ./doggo.nix { };
-      emulsion-palette = callPackage ./emulsion-palette.nix { };
       gol-c = callPackage ./gol-c.nix { };
       gnome-search-provider-recoll =
         callPackage ./gnome-search-provider-recoll.nix { };

pkgs/emulsion-palette.nix

@@ -1,42 +0,0 @@
-{ stdenv
-, lib
-, fetchFromGitHub
-, meson
-, ninja
-, vala
-, wrapGAppsHook4
-, libadwaita
-, json-glib
-, libgee
-, pkg-config
-, gtk3
-, desktop-file-utils
-}:
-
-stdenv.mkDerivation rec {
-  pname = "emulsion-palette";
-  version = "3.3.9";
-
-  src = fetchFromGitHub {
-    owner = "lainsce";
-    repo = "emulsion";
-    rev = version;
-    sha256 = "sha256-xG7yZKbbNao/pzFhdTMof/lw9K12NKZi47YRaEd65ok=";
-  };
-
-  nativeBuildInputs = [ meson ninja pkg-config vala wrapGAppsHook4 ];
-
-  buildInputs = [
-    desktop-file-utils
-    gtk3 # We're only using it for the gtk-update-icon-cache utility.
-    json-glib
-    libadwaita
-    libgee
-  ];
-
-  meta = with lib; {
-    description = "Store your color palettes in an easy way";
-    homepage = "https://github.com/lainsce/emulsion";
-    license = licenses.gpl3Only;
-  };
-}