Add task list formatting

[txtyash]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

Task list is incorrectly formatted. Remark-ls escapes brackets.

Solution

There's no need to escape brackets. Just format task list like prettier does.

Alternatives

[wooorm]

Not enough info.

[github-actions]

Hi! This was closed. Team: If this was fixed, please add phase/solved. Otherwise, please add one of the no/* labels.

[evccyr]

@wooorm
The task list should look like this:

- [ ] Artificial Intelligence
  - [ ] Unit III **Adversarial Search and Games**
  - [ ] Unit IV **Knowledge**
  - [ ] Unit V **Reasoning**
  - [ ] Unit VI **Planning**
  - [ ] Prelim Questions

but on saving the file it looks like:

*   \[ ] Artificial Intelligence
    *   \[ ] Unit III **Adversarial Search and Games**
    *   \[ ] Unit IV **Knowledge**
    *   \[ ] Unit V **Reasoning**
    *   \[ ] Unit VI **Planning**
    *   \[ ] Prelim Questions