Remove dune3d package (it’s in nixpkgs now)

hosts/Disco.nix

@@ -71,7 +71,7 @@
         openscad
         freecad
         solvespace
-        (pkgs.callPackage ../packages/dune3d.nix {})
+        dune3d
 
         vscodium
         marktext

packages/dune3d.nix

@@ -1,65 +0,0 @@
-{
-    cmake,
-    eigen,
-    fetchFromGitHub,
-    glm,
-    gobject-introspection,
-    gtkmm4,
-    lib,
-    libepoxy,
-    librsvg,
-    libspnav,
-    libuuid,
-    meson,
-    ninja,
-    opencascade-occt,
-    pkg-config,
-    python3,
-    gcc13Stdenv,
-    wrapGAppsHook,
-}:
-
-gcc13Stdenv.mkDerivation rec {
-    pname = "dune3d";
-    version = "1.1.0";
-
-    src = fetchFromGitHub {
-        owner = "dune3d";
-        repo = "dune3d";
-        rev = "v${version}";
-        hash = "sha256-Z/kdOc/MbnnEyRsel3aZGndTAy1eCdAK0Wdta0HxaE4=";
-    };
-
-    nativeBuildInputs = [
-        gobject-introspection
-        meson
-        ninja
-        pkg-config
-        wrapGAppsHook
-    ];
-    buildInputs = [
-        cmake
-        eigen
-        glm
-        gtkmm4
-        libepoxy
-        librsvg
-        libspnav
-        libuuid
-        opencascade-occt
-        (python3.withPackages (pp: [
-            pp.pygobject3
-        ]))
-    ];
-
-    env.CASROOT = opencascade-occt;
-
-    meta = with lib; {
-        description = "3D CAD application";
-        homepage = "https://dune3d.org";
-        license = licenses.gpl3Plus;
-        mainProgram = "dune3d";
-        platforms = platforms.linux;
-    };
-}
-