feature: readme examples for lua toggle instead of `open`

[davidgamero]

Did you check the docs?

• [X] I have read all the trouble.nvim docs

Is your feature request related to a problem? Please describe.

when using the configs from the README, the lua examples don't toggle, while the vim script ones do

Describe the solution you'd like

offer a new set of lua example keymaps that do allow toggling, or update the existing ones to do so since i don't think it's an issue to add toggle when the current just opens (and does nothing once trouble is open)

Describe alternatives you've considered

putting a link to how to implement this yourself, but that is less user-friendly

Additional context

No response

[folke]

Just replace open with toggle and you're good to go. I've also updated the docs.

[davidgamero]

Tysm!