Make sure EPUB generation work

[V0XNIHILI]

Resolves #83. I hope to have this working tomorrow! For now, running into issues with the formats of some images.

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[profvjreddi]

Looking forward to it 🙌

[V0XNIHILI]

I will not proceed with adding PDF support, it is proving to be too hard as there are many constructs that work fine in EPUB and HTML but not in the PDF. Examples include:

• Citing references in captions
• Sometimes, arbitrary jpg and png figures are not supported by XeTeX...
• .webp figures (although I already fixed this)
• SVG images (need extra conversion step using Inkscape), used here for example:

[profvjreddi]

OK let's not worry about the PDF then. I was also told that we have to fix our figures etc. quite a bit to make it work well. We can work on that in the future. Thanks for trying @V0XNIHILI