build: remove unused `nix/overlays/`

nix/overlays/Cabal-3.10.1.0.nix

-{ mkDerivation, array, base, bytestring, Cabal-syntax, containers
-, deepseq, directory, filepath, lib, mtl, parsec, pretty, process
-, text, time, transformers, unix
-}:
-mkDerivation {
-  pname = "Cabal";
-  version = "3.10.1.0";
-  sha256 = "0bdbab8e4c3178016fb0f070d8b62bc3067f93afabfbd3aa17c8065d0ecc98ee";
-  setupHaskellDepends = [ mtl parsec ];
-  libraryHaskellDepends = [
-    array base bytestring Cabal-syntax containers deepseq directory
-    filepath mtl parsec pretty process text time transformers unix
-  ];
-  doCheck = false;
-  doHaddock = false;
-  homepage = "http://www.haskell.org/cabal/";
-  description = "A framework for packaging Haskell software";
-  license = lib.licenses.bsd3;
-}

nix/overlays/Cabal-syntax-3.10.1.0.nix

-{ mkDerivation, array, base, binary, bytestring, containers
-, deepseq, directory, filepath, lib, mtl, parsec, pretty, text
-, time, transformers, unix
-}:
-mkDerivation {
-  pname = "Cabal-syntax";
-  version = "3.10.1.0";
-  sha256 = "3b80092355327768a0de8298ac50ee906b7e82462e2ba14542730573b453f522";
-  libraryHaskellDepends = [
-    array base binary bytestring containers deepseq directory filepath
-    mtl parsec pretty text time transformers unix
-  ];
-  homepage = "http://www.haskell.org/cabal/";
-  description = "A library for working with .cabal files";
-  license = lib.licenses.bsd3;
-  doCheck = false;
-  doHaddock = false;
-}

nix/overlays/cabal-install-3.10.1.0.nix

-{ mkDerivation, array, async, base, base16-bytestring, binary
-, bytestring, Cabal, Cabal-described ? null, cabal-install-solver
-, Cabal-QuickCheck ? null, Cabal-syntax, Cabal-tree-diff ? null, containers
-, cryptohash-sha256, directory, echo, edit-distance, exceptions
-, filepath, hackage-security, hashable, HTTP, lib, lukko, mtl
-, network-uri, parsec, pretty, pretty-show, process, QuickCheck
-, random, regex-base, regex-posix, resolv, safe-exceptions, stm
-, tagged, tar, tasty, tasty-expected-failure, tasty-golden
-, tasty-hunit, tasty-quickcheck, text, time, tree-diff, unix, zlib
-}:
-mkDerivation {
-  pname = "cabal-install";
-  version = "3.10.1.0";
-  sha256 = "995de368555449230e0762b259377ed720798717f4dd26a4fa711e8e41c7838d";
-  revision = "1";
-  editedCabalFile = "0h1ra9kw7mk70202whiphbdyvknm7jbhqhkgw4h8abb1sgffhs3n";
-  isLibrary = true;
-  isExecutable = true;
-  libraryHaskellDepends = [
-    array async base base16-bytestring binary bytestring Cabal
-    cabal-install-solver Cabal-syntax containers cryptohash-sha256
-    directory echo edit-distance exceptions filepath hackage-security
-    hashable HTTP lukko mtl network-uri parsec pretty process random
-    regex-base regex-posix resolv safe-exceptions stm tar text time
-    unix zlib
-  ];
-  executableHaskellDepends = [
-    base Cabal Cabal-syntax directory filepath
-  ];
-  testHaskellDepends = [
-    array base bytestring Cabal Cabal-described cabal-install-solver
-    Cabal-QuickCheck Cabal-syntax Cabal-tree-diff containers directory
-    filepath hashable mtl network-uri pretty-show QuickCheck random
-    tagged tar tasty tasty-expected-failure tasty-golden tasty-hunit
-    tasty-quickcheck time tree-diff zlib
-  ];
-  doCheck = false;
-  doHaddock = false;
-  enableExecutableProfiling = false;
-  postInstall = ''
-    mkdir -p $out/share/bash-completion
-    mv bash-completion $out/share/bash-completion/completions
-  '';
-  homepage = "http://www.haskell.org/cabal/";
-  description = "The command-line interface for Cabal and Hackage";
-  license = lib.licenses.bsd3;
-  mainProgram = "cabal";
-}

nix/overlays/cabal-install-solver-3.10.1.0.nix

-{ mkDerivation, array, base, bytestring, Cabal, Cabal-syntax
-, containers, edit-distance, filepath, lib, mtl, pretty, tasty
-, tasty-hunit, tasty-quickcheck, transformers
-}:
-mkDerivation {
-  pname = "cabal-install-solver";
-  version = "3.10.1.0";
-  sha256 = "2c0d9edd4ccd746e9bf8ab4f92b1ecffe2f56eae29395c67ef5ca091a6f49f37";
-  revision = "1";
-  editedCabalFile = "1l3qhaiv0m2xc5vscggd2drinam1k4x0l3vfvvz15xrpvxypdv4d";
-  libraryHaskellDepends = [
-    array base bytestring Cabal Cabal-syntax containers edit-distance
-    filepath mtl pretty transformers
-  ];
-  testHaskellDepends = [
-    base Cabal Cabal-syntax tasty tasty-hunit tasty-quickcheck
-  ];
-  homepage = "http://www.haskell.org/cabal/";
-  description = "The command-line interface for Cabal and Hackage";
-  license = lib.licenses.bsd3;
-  doCheck = false;
-  doHaddock = false;
-}

nix/overlays/directory-1.3.7.0.nix

-{ mkDerivation, base, filepath, lib, time, unix }:
-mkDerivation {
-  pname = "directory";
-  version = "1.3.7.0";
-  sha256 = "9f86bd60a4909eef66907c15fc108883439b8fba3b428fb56aaa056631b62d10";
-  revision = "2";
-  editedCabalFile = "13krvs6zfswr3xndysq1bg7mz9n8mm1w7p4zcx8xjs0jqkm8hiyl";
-  libraryHaskellDepends = [ base filepath time unix ];
-  testHaskellDepends = [ base filepath time unix ];
-  description = "Platform-agnostic library for filesystem operations";
-  license = lib.licenses.bsd3;
-  doCheck = false;
-  doHaddock = false;
-}

nix/overlays/hackage-security-0.6.2.3.nix

-{ mkDerivation, aeson, base, base16-bytestring, base64-bytestring
-, bytestring, Cabal, Cabal-syntax, containers, cryptohash-sha256
-, directory, ed25519, filepath, ghc-prim, lib, lukko, mtl, network
-, network-uri, parsec, pretty, QuickCheck, tar, tasty, tasty-hunit
-, tasty-quickcheck, template-haskell, temporary, text, time
-, transformers, unordered-containers, vector, zlib
-}:
-mkDerivation {
-  pname = "hackage-security";
-  version = "0.6.2.3";
-  sha256 = "52ee0576971955571d846b8e6c09638f89f4f7881f4a95173e44ccc0d856a066";
-  revision = "3";
-  editedCabalFile = "1vdmpklil8a6r03ixzch5d36ngimmq5q8931i8bg9f7hh8nmq8jv";
-  libraryHaskellDepends = [
-    base base16-bytestring base64-bytestring bytestring Cabal
-    Cabal-syntax containers cryptohash-sha256 directory ed25519
-    filepath ghc-prim lukko mtl network network-uri parsec pretty tar
-    template-haskell time transformers zlib
-  ];
-  testHaskellDepends = [
-    aeson base bytestring Cabal Cabal-syntax containers network-uri
-    QuickCheck tar tasty tasty-hunit tasty-quickcheck temporary text
-    time unordered-containers vector zlib
-  ];
-  homepage = "https://github.com/haskell/hackage-security";
-  description = "Hackage security library";
-  license = lib.licenses.bsd3;
-  doCheck = false;
-  doHaddock = false;
-}

nix/overlays/process-1.6.15.0.nix

-{ mkDerivation, base, bytestring, deepseq, directory, filepath, lib
-, unix
-}:
-mkDerivation {
-  pname = "process";
-  version = "1.6.15.0";
-  sha256 = "44b31b6cd3129893ac1a007573dedb69dde667fa06ee108526d58f08b1a1f7ab";
-  libraryHaskellDepends = [ base deepseq directory filepath unix ];
-  testHaskellDepends = [ base bytestring directory ];
-  description = "Process libraries";
-  license = lib.licenses.bsd3;
-  doCheck = false;
-  doHaddock = false;
-}