Highlight code blocks according to the current theme

[jyn514]

r? @Nemo157

Closes #1127

[jyn514]

Dark mode:

Ayu:

Light (stays the same, but just in case):

Readme (Ayu):

Readme (Dark):

Source (Ayu):

So I think what I'm seeing is it would be nice to have another theme for Ayu mode, but I'm not sure if highlight.js has one. @Cldfire do you happen to know of one that matches?

[Cldfire]

So I think what I'm seeing is it would be nice to have another theme for Ayu mode, but I'm not sure if highlight.js has one. @Cldfire do you happen to know of one that matches?

There isn't a pre-existing one that I'm aware of, but I'd be happy to put one together tomorrow night, it won't take long 😄

EDIT: haven't gotten to this yet but will this afternoon

[jyn514]

Oh wow! That would be awesome if you have time ❤️ I was just hoping for something somewhat close.

[jyn514]

I think it makes sense to merge this as is and then work on the custom theme in a follow-up - this is already a big improvement even on ayu and it would make it easier for @Cldfire to PR against the main codebase instead of my fork I think.

@Nemo157 does this look good to you?