zsh/plugins: get quitcd from package directly

This removes the need to download nnn's source, saving us a few seconds.

I also don't need to periodically bump that fetcher hash, since it
happens every time nixpkgs gets bumped.

home/common/zsh/plugins.nix

@@ -11,13 +11,8 @@
     }
     {
       name = "nnn-quitcd";
-      file = "misc/quitcd/quitcd.bash_sh_zsh";
-      src = pkgs.fetchFromGitHub {
-        owner = "jarun";
-        repo = "nnn";
-        rev = "efd5bc9db100d0489cfb3d982a69b04dacaff852";
-        sha256 = "sha256-A0XxC8/DNb2GuIxPVUiWNsfaq+UysVRYHG8fl/Iyaaw=";
-      };
+      file = "share/quitcd/quitcd.bash_sh_zsh";
+      src = pkgs.nnn;
     }
     {
       name = "craftos-select";