[Request] Ability to export as epub/PDF?

First off, I love these guides in Markdown. They've been super helpful guides to me whenever I remember I need them 😄

Lately I've been working on a Calibre library to keep all of my collected knowledge, and most e-readers don't seem to love Markdown. Instead, I wanted to broach the possibility of a format exporter feature for
- A user-provided list of guides or selecting all guides
- EPUB/PDF/zip formats
- an HTML table of contents to easily find a guide

EPUB files are basically a folder collection of HTML and CSS with _minimal_ styling. Being able to have these on an e-reader or even just print-friendly would be great for offline use.

Just an idea!