markdown-it Footnote Plugin

This package provides footnote support for the `markdown-it` markdown parser, implementing both standard and inline footnote syntax based on Pandoc's definition. It integrates seamlessly as a `markdown-it` plugin, extending the parser's capabilities to render footnote references and their corresponding definitions into semantic HTML, complete with back-references. The current stable version is 4.0.0. As a plugin for `markdown-it`, its release cycle often aligns with `markdown-it`'s own, though it maintains independent versioning. Its primary differentiator is its robust and spec-compliant implementation of footnotes within the `markdown-it` ecosystem, offering dedicated customization points for the rendered HTML structure, ensuring flexibility for various output requirements.