Uses the fantastic gptel to extend the equally fantastic magit with some LLM-powered functionality.

Functionality is provided for:

• Generating commit messages
• Explaining diffs

Install the package and run gptel-magit-install at an appropriate time, for example:

(use-package gptel-magit
  :ensure t
  :hook (magit-mode . gptel-magit-install))

You can generate a commit message in two ways:

1. In the magit transient commit buffer, you can press g to create a commit with a pre-generated message.
2. In an already started git-commit buffer, you can press M-g to generate a message.

With the cursor placed on a magit diff section, you can request an explanation by pressing d (to invoke the diff action), and then x.

Prompts, and some other options can be customised, see `customize-group magit-gptel`.