Website Additions and Changes

Added margin notes using Nina Zuzumel's implementation. Have not tested extensively yet but looks good.

I am only adding them to posts for now, not notes --- but I may change that. I'd like to potentially use numbered notes (side notes) soon, but will use this as a base.

One example is in On Martha Silano's 'Is This My Last Ferry Trip?'. Another is in The Obligation Before Us.

I will tweak the display a bit further, but this was mostly plug and play with a few small changes.

Following guidance from Reilly Spitzfaden's page about implementing webmentions, I've begun working on adding webmentions. All notes and posts have a link to my webmentions endpoint: https://webmention.io/nearerandfarther.com/webmention. I'll work on displaying webmentions soon.