Based on https://www.markdownlang.com/extended/footnotes.html
* Both "official" [^1] and [^1]: def
* And inline ^[My foot note]
Features:
* Properly parsed in markdown parser
* Syntax highlighting
* Live Preview to ... when on-hover preview of content, on-click moves
cursor to definition
* Reference completion
* Invalid references are marked
Zef Hemel