Task lists are rendered as disabled and with dashes

🐛 Bug Report

Prerequisites

• I’m using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io
• I have read the console error message carefully (if applicable)

Description

Task list markdown syntax as follows does not render as it does on Github:

- [  ] task 1
- [  ] task 2
- [  ] task 3

I’d expect the above to render as a list of checkboxes without the preceding dash that can be clicked like so;

• task 1
• task 2
• task 3

Instead it renders like so;

Have you read the Contributing Guidelines on issues?

Yes

Steps to reproduce

https://codesandbox.io/s/unruffled-shape-3m6td?file=/docs/intro.md

1. See the task list retains the dash before the checkboxes
2. Checkboxes cannot be clicked

Expected behavior

• Preceding dash should be stripped
• Checkboxes should be clickable

Actual behavior

(Write what happened. Add full console log messages and screenshots, if applicable.)

Your environment

• Public source code:
• Public site URL:
• Docusaurus version used: 2.0.0-beta.4
• Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0): Version 92.0.4515.159 (Official Build) (x86_64)
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): macOS 11.5.2

Reproducible demo

https://3m6td.sse.codesandbox.io/docs/intro

[SamarthAroraa]

Hi @slorber, I would like to work on this issue.

[himanshu007-creator]

Hi @SamarthAroraa, can you please drop a “HI” confirming you are working in the issue, otherwise i can work on the issue