Website: Add +list-keybinds note for people searching for default keybindings

[mastercaution]

I searched quite a long time for the default keybindings. I expected at least a hint or something in the documentation but I couldn't find anything. So I ended up looking them up in the source code (src/config/Config.zig).

Later, by coincidence, I found the +list-keybinds option and felt very dumb 😅.

So I would like to suggest adding a small note on the website that reminds people like me that this option exist. Similar to the section for +list-themes.

What about adding this at the beginning of website/docs/config/keybind/index.mdx?

<Note>
To see a list of active keybindings including default keybindings, you can use the `+list-keybinds` CLI:

```sh
ghostty +list-keybinds
```
</Note>

I'm sure this would prevent some headaches.

[brentdurksen]

I agree with this! I also have scoured the docs for default keybindings, resorted to reading source code, and eventually found a 3rd party gist listing the platform-specific default keybindings. So I would support either featuring the +list-keybinds CLI flag prominently on the keybinding documentation, or including a page in the docs that lists the default keybindings.

[rhodes-b]

This is something more suited to add to the website repo here https://github.com/ghostty-org/website

[brentdurksen]

According to https://github.com/ghostty-org/website/blob/main/CONTRIBUTING.md, this is the correct forum to post new feature requests (e.g. new content) for the ghostty.org website