Enforce asterisk-style unordered lists

[iansan5653]

Asterisk style lists (ie, * item) are preferred over other list styles because asterisks are most likely to be read out by screen readers. For example, given the following Markdown:

Fruits:

* Apple
* Banana
* Pear

VoiceOver on my machine reads:

Fruits {pause} star apple star banana star pear

Whereas with the following Markdown:

Fruits:

- Apple
- Banana
- Pear

VoiceOver reads:

Fruits {pause} apple {pause} banana {pause} pear

This makes it much less obvious that what is being read is actually a list.

---

The current configuration enables the ul-style rule, but by default this rule has the style parameter set to consistent. This ensures that the list style is consistent across the whole file, based on the first encountered list item. What we really want is asterisk, which ensures that the list delimiter is always the * character.

[accessibility-bot]

👋 Hello and thanks for pinging us! An accessibility first responder will review this soon.

• 💻 On PRs for our review: please provide a review environment with steps to validate, screenshots (with alt text), or videos (with description following) demonstrating functionality we should be checking. This will help speed up our review and feedback cycle.
• ⚠️ If this is urgent, please visit us in #accessibility on Slack and tag the first responder(s) listed in the channel topic.

[andrialexandrou]

Repeating my comment from Slack:

I’m the likely candidate for the person who put that rule in the accessibility set, and if memory serves it was with the asterisk rule in mind. If it’s up to me we can merge this.

Approving.