Use MathML for math formatting

[MatthijsBlom]

For now this is only a proof of concept.
If this direction is appreciated, I might look into it further.

To Do:

• test on a variety of clients
• find a more suitable math font

Before	After

[pierluc-codes]

I like it!

For few second, I was hesitant because the previous syntax was closer to code. But, we are talking math, so the visual make sense.

If you can upload it somewhere, I can test on my iDevice and check if render similar.

Thanks!

[ulysses4ever]

Great contribution, thanks!

Small comments inline.

[MatthijsBlom]

If you can upload it somewhere, I can test on my iDevice and check if render similar.

This branch is now live at matthijsblom.github.io/learnyouahaskell.github.io.

Need I fear that the changed build script (to be reverted before merge) on this branch will cause spurious builds in this repo? We don't want this branch served at learnyouahaskell.github.io.

[ulysses4ever]

Off-topic: We really should implement automatic PR preview. But last time I looked at it recently, is a bit of a pain in the neck to set up.

[pierluc-codes]

This branch is now live at matthijsblom.github.io/learnyouahaskell.github.io.

All good on my iDevice. Thank you!

[pierluc-codes]

@MatthijsBlom

If you can revert the github action change, remove the draft then I will approve. Thank you!

[ulysses4ever]

LGTM modulo the workflow edits to deploy locally

[MatthijsBlom]

I think I've covered the whole book now.

I don't think the $…$-ification of single names is a big improvement. But using `…` or *…* isn't great either, nor is not styling at all. My preference for $…$ is very mild. In any case, let's be consistent.

I'll rebase to improve the commit messages and remove the CI change after incorporating the final feedback.

( By the way: I've been doing a pass through the whole book. If you're curious, see my dump branch. Not everything on there is meant for eventual merging. )

[ulysses4ever]

I'm fine with $'s for single identifiers. I resolved all my comments from earlier, so to my mind this is ready to go.