emacs.pkgs.ligo-mode: remove

This package was in melpaPackages.  Then, it was moved[1] to
manualPackages to workaround failure of MELPA update.  Then, it was
removed[2] from MELPA.

To reduce maintenance burden, let's also remove it.

[1]: https://github.com/NixOS/nixpkgs/pull/227531
[2]: https://github.com/melpa/melpa/commit/c8a86d223f5e764419aaf964d69a30350f74f904#commitcomment-130288082

pkgs/applications/editors/emacs/elisp-packages/manual-packages/ligo-mode/package.nix

@@ -1,33 +0,0 @@
-{
-  stdenv,
-  lib,
-  melpaBuild,
-  fetchFromGitLab,
-  unstableGitUpdater,
-}:
-
-melpaBuild {
-  pname = "ligo-mode";
-  version = "1.7.0-unstable-2024-08-22";
-
-  src = fetchFromGitLab {
-    owner = "ligolang";
-    repo = "ligo";
-    rev = "47128d41a9329356cbad40a982d8144da19a9218";
-    hash = "sha256-IrxPnbWrhqe3TxELsqa2y4NdcfEJMGUcGCdNuDG+rfs=";
-  };
-
-  files = ''("tools/emacs/ligo-mode.el")'';
-
-  ignoreCompilationError = false;
-
-  passthru.updateScript = unstableGitUpdater { };
-
-  meta = {
-    description = "Major mode for editing LIGO source code";
-    homepage = "https://gitlab.com/ligolang/ligo";
-    license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ AndersonTorres ];
-    broken = stdenv.isDarwin; # different src hash on darwin
-  };
-}

pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix

@@ -130,7 +130,7 @@ let
         ligo-mode =
           if super.ligo-mode.version == "0.3"
           then markBroken super.ligo-mode
-          else null; # auto-updater is failing; use manual one
+          else super.ligo-mode;
 
         # upstream issue: missing file header
         link = markBroken super.link;