GreenLight does not put in OpenGraph meta tags

[ffdixon]

Is your feature request related to a problem? Please describe. When posting a GreenLight URL to social media, most sites look for OpenGraph tags in the HTML5 header to create a formatted message. See

https://ahrefs.com/blog/open-graph-meta-tags/

Describe the solution you'd like Have GreenLight put in default values for og:title, og:description, and og:image.