Add social metadata to GUADEC web pages
These days the URLs likely to be shared through social networks need to add some particular metadata those services can explote creating thumbnails, excepts, etc, automagically. This feature is used by Twitter, Facebook, Discourse forum system, Telegram, Whatsapp, Matrix...
I know it's late to really enjoy the benefits of this change. At least it would be more useful for next year website.
Seems this tool could help to do the job https://megatags.co/
(I've made the same in my own website using Jekyll, if it helps)