* [ ] handle when the featured image is actually a video, like here: https://montrehack.ca/2021/04/21/canada-crackme.html * [x] handle when the featured image is hosted externally * [ ] verify archives for failure cases including before we were using the `featured_img` yaml front-matter * [ ] add a summary tag everywhere too Validators: * https://cards-dev.twitter.com/validator * https://developers.facebook.com/tools/debug/