Bluesky for comments section

[rdboyes]

People have been using Bluesky for comments sections on blog posts on other platforms (e.g. quarto), and setting it up with a Franklin.jl blog is pretty simple (blog post describing the steps here: https://www.randy.pub/posts/blueskycomments/). Happy to contribute a guide/code/etc if this is something that is of interest, but I'm not sure where the best place to put it would be.