doc: add example to disable arrow keys in insert mode (#4088)

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@ -351,6 +351,21 @@ with modal editors.
| `Home` | Move to line start | `goto_line_start` |
| `End` | Move to line end | `goto_line_end_newline` |
If you want to disable them in insert mode as you become more comfortable with modal editing, you can use
the following in your `config.toml`:
```toml
[keys.insert]
up = "no_op"
down = "no_op"
left = "no_op"
right = "no_op"
pageup = "no_op"
pagedown = "no_op"
home = "no_op"
end = "no_op"
```
## Select / extend mode
This mode echoes Normal mode, but changes any movements to extend