Add Twitter and Open Graph support #19
Description
Most social sites have support for the Twitter Cards or Open Graph protocols. This gives links posted to those sites some special styling.
It's possible to check what a Twitter Card will look like with: https://cards-dev.twitter.com/validator.
It's possible to check what an Open Graph card will look like with: https://www.opengraph.xyz/.
The goal here would be to automate the generation for those tags. It should also be possible to provide a card image for any page as well as a default for the site itself.