Open Graph info #44

So, I don't know exactly where oEmbed data is inferred from, but I'd like our site to have at least the page title and probably the initial paragraph in an embed preview. Hopefully there are plugins for gitbook that can do this, but I didn't look. Opening this issue so this isn't forgotten and someone who's interested knows that we'd like to have this.

https://oembed.com/

We're looking for Open Graph, documented at https://ogp.me/.