Add support for grey and brown in the new highlight colour feature

Feature requests
1

Use case or problem

I love the new highlight colour feature, but I would appreciate if a grey highlight was available for visual consistency with the grey of quote callouts. Since there is no grey circle emoji, imho :white_circle: or :black_circle: would work best.

Proposed solution

Introduce a grey highlight in the same manner as the other supported colours, via :white_circle: or :black_circle:.

Current workaround (optional)

To either use another highlight colour for quotes despite the mismatch with callouts, or use the Prism theme’s built-in highlights that are invoked via HTML as <mark class="grey">text</mark>

Related feature requests (optional)

Couldn’t find any.

2

Don’t forget :brown_circle:。 I think every emoji color can be supported.
:red_circle::orange_circle::yellow_circle::green_circle::blue_circle::purple_circle::brown_circle::black_circle::white_circle:

3

Thanks, I wasn’t sure if I should request brown as well, as I don’t think I would personally use that, but I can update the title.

There are also some colours that don’t have circles, but I’ve seen hearts used as colour symbols in other apps, such as :pink_heart: pink, :light_blue_heart: light blue (and actually there’s a grey heart as well :grey_heart:).