Better highlight for `@markup.list`

[One-In-Dark]

Hi! I just started to edit Markdown file in neovim.

I use :set breakindent and :set showbreak=↪. (The specific character should not matter.) The 'showbreak' character is printed at the beginning of a line. Here's a screencap of what it looks like:

Since the NonText and @markup.list have the same highlight, it's a bit hard to distinguish list marker from 'showbreak' characters.

IMO the @markup.list here is more like a "control flow" thing, since it's a "block level" construct. Maybe we shall set it to a foreground (warm) color, rather than a fade-out color like now? Thanks!

For example, if we set it to c.yellow, it looks much better (IMHO):

[One-In-Dark]

I just found that linking it to @punctuation.delimiter is a viable choice. And IMO it's consistent (at the semantics level) with the current design, which is linking it to Delimiter. What do you think about this proposal? 😄