feature: add non-italics variant

[GeorgeBarlow]

Describe the solution you'd like

Is it possible to get a non-italic variant for each theme like rose-pine/vscode@d73a53e implemented? Unless this has already been done and I've missed something?

Additional context

No response

[GeorgeBarlow]

I completely overlooked

styles = {
    italics = false
}

I do apologise.