Enable pre-commit for Markdown All in One

[gnawin]

Proposal

To run Markdown All in One as part of a pre-commit workflow, and provide relevant information to the repos list in the project's .pre-commit-config.yaml.

Other information

My user case is automatic formatting of tables. Adding Markdown All in One as part of the workflow will ensure a consistent style.

[yzhang-gh]

Thanks for your suggestion. It looks similar as #1394 which is about the TOC.

The difference is that GFM table formating should already be done by other packages, e.g. Prettier?

[gnawin]

Thank you. We've changed to Prettier. If there were a pre-commit hook for Markdown All in One, we would have chose it :)