treewide: start transitioning to nixpkgs package structure

pkgs/applications/misc/ani-cli/README.md

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+# ani-cli
+
+ani-cli is already in nixpkgs. The sole reason it's been put in this overlay is so that
+I can receive the updates _as they happen_ and not wait until a maintainer bumps it up.
+
+The source for ani-cli is updated periodically.

pkgs/applications/misc/ani-cli/default.nix

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+{
+  fetchFromGitHub,
+  makeWrapper,
+  stdenvNoCC,
+  lib,
+  gnugrep,
+  gnused,
+  wget,
+  fzf,
+  mpv,
+  aria2,
+  pins,
+}: let
+  pin = pins.ani-cli;
+in
+  stdenvNoCC.mkDerivation {
+    pname = "ani-cli";
+    inherit (pin) version;
+
+    src = fetchFromGitHub {
+      inherit (pin.repository) owner repo;
+      sha256 = pin.hash;
+      rev = pin.revision;
+    };
+
+    nativeBuildInputs = [makeWrapper];
+
+    installPhase = ''
+      runHook preInstall
+      install -Dm755 ani-cli $out/bin/ani-cli
+      wrapProgram $out/bin/ani-cli \
+        --prefix PATH : ${lib.makeBinPath [gnugrep gnused wget fzf mpv aria2]}
+      runHook postInstall
+    '';
+
+    meta = with lib; {
+      homepage = "https://github.com/pystardust/ani-cli";
+      description = "A cli tool to browse and play anime";
+      license = licenses.gpl3Plus;
+      maintainers = with maintainers; [NotAShelf];
+      platforms = platforms.unix;
+    };
+  }