Use package instead of submodule for chatgpt-shell

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "chatgpt-shell"]
-	path = chatgpt-shell
-	url = https://github.com/xenodium/chatgpt-shell

config.org

@@ -1341,14 +1341,11 @@
    #+end_src
 
 ** ChatGPT
-   The =chatpt-shell= package is in a git submodule, so this has to be
-   added to the [[help:load-path][load-path]] and ~require~'d:
+   The =chatpt-shell= package provides a shell-like interface for
+   ChatGPT.
 
    #+begin_src emacs-lisp
-     (let ((path (concat (getenv "HOME")
-                         "/.emacs.d/chatgpt-shell")))
-       (add-to-list 'load-path path))
-     (require 'chatgpt-shell)
+	 (use-package chatgpt-shell)
    #+end_src
 
    [[help:chatgpt-shell-openai-key][chatgpt-shell-openai-key]] must also be set to a function that