This is a 3 part repo test

1. remark plugin that finds "alternative" footnotes which look like:

Here is the first reference [%note].

[%note]: Definition of the aside note

Some more text

2. rehype handler which renders them as sidenotes using https://edwardtufte.github.io/tufte-css/ and https://gwern.net/sidenote as inspiration.

3. Carta plugin based on https://github.com/maisonsmd/carta-plugin-subscript that incorporates it into the editor