Feature Request: Notion-like Spoiler and Additional Admonition Color

[qaeren]

Hello, @libeanim!

First off, thank you very much for the plugin! It makes my transition from Notion much, much easier!

But because I was introduced to a toggle list in Notion first, I am now very much in favor of the way it looks there over the spoiler it's possible to generate with your plugin.

Would you kindly consider tinkering with the config file to add ability for a spoiler to look like a Notion toggle list?

Namely: it looks just like any other text, it's not bold, it's not framed, but it has a triangle pictogram before the "heading" line. (Maybe have it work like spoiler-inline?)

Here's how it looks in Notion:

Also, I'd like to have a grey color option for the admonition.

Look suggestion number one:

Look suggestion number two

I'm not a programmer myself and I'm not able to make these changes myself, but these features matter to me because I use them quite often.

Hopefully, you'll agree. Anyways, thanks!