Add Open Graph support to Quarto Revealjs

[danielvartan]

Description

Hi there! 👋

Currently, Quarto’s Revealjs format does not support the Open Graph Protocol, even when used in a website project. I’d like to request this feature to enable better link previews.

While it's possible to add Open Graph metadata manually, having built-in support would be more convenient.

I've provided a reproducible example in this repository: https://github.com/danielvartan/test

Thanks!