vimUtils: move hooks to new directory

Add some organization

pkgs/applications/editors/vim/plugins/vim-utils.nix

···
         vimBinary = "${vim}/bin/vim";
         inherit rtpPath;
       };
-    } ./vim-gen-doc-hook.sh
+    } ./hooks/vim-gen-doc-hook.sh
   ) { };
 
   vimCommandCheckHook = callPackage (
···
         vimBinary = "${neovim-unwrapped}/bin/nvim";
         inherit rtpPath;
       };
-    } ./vim-command-check-hook.sh
+    } ./hooks/vim-command-check-hook.sh
   ) { };
 
   neovimRequireCheckHook = callPackage (
···
         nvimBinary = "${neovim-unwrapped}/bin/nvim";
         inherit rtpPath;
       };
-    } ./neovim-require-check-hook.sh
+    } ./hooks/neovim-require-check-hook.sh
   ) { };
 
   inherit