Update Catppuccin for all variants

[jolheiser]

Resolves #686

❗ I've removed the catppuccin theme and replaced it with catppuccin-mocha in order to make them all standard. Let me know if you want me to change it back to just catppuccin, I realize it's potentially a breaking change but there hasn't been a new release cut and it's only been merged for a few days, so I changed it for now.

The following previews are HTML of the HTML code of these variants, because inception is cool and the Go lexer doesn't show off enough of the colors based on just the style's Go file. 😅

Latte

Frappe

Macchiato

Mocha

[nekowinston]

Those are just the things that immediately jumped out to me.
I'd either like to spend some more time tomorrow reviewing the highlights, or send another PR to implement those changes, should I find any.

[jolheiser]

@nekowinston did you want to do another review or should I appease the linter gods?

[alecthomas]

I don't suppose either of you have encountered a commonly used machine-readable format for themes?

[jolheiser]

I don't suppose either of you have encountered a commonly used machine-readable format for themes?

I haven't, because most have their own set of keys/values available.
Most of what I've seen is in JSON, but I've seen XML used here and there.

---

I've appeased the linter, I think this is ready to go. Anything further can happen in a follow-up, as it wouldn't change names and so shouldn't break anything,

[sgoudham]

Looks 🔥 🔥 Excited to see this get merged!

[alecthomas]

I think we're waiting for another pass by @nekowinston , let's give it another day or two then remind me to merge it.

[jolheiser]

@alecthomas I think we're okay to merge this. 🚀
If @catppuccin requires further changes we can address a follow-up PR. At least then it will only be color changes, the names should remain stable.

[nekowinston]

Sorry for causing a delay here - this seems fine. We should really work on a more defined styleguide, so that we have more defined docs which colors should map to which tokens; but this seems good for now.

[alecthomas]

👍

Thanks everyone!