Update plugins.md

[mvogelgesang]

Adding rehype-table-data-label to the listing

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)
• [-] If applicable, I’ve added docs and tests

Description of changes

Adding a link to a plugin I wrote to help turn markdown tables into more responsive HTML.

[ChristianMurphy]

Welcome @mvogelgesang! 👋
Thanks for sharing!

Some criteria to include packages in this list.

• Some documentation with at least some instructions on how to use the package.
• A CI job to run tests. (The tests are already there.)
• A prepack script and CI job to build the types. (The JSDoc types are already there.)
• The package should be published to npm.

source: syntax-tree/hast#24 (comment)

Some more specific feedback:

• data-label isn't standard and doesn't do anything, is this library intended to be used with a specific stylesheet or JavaScript library that does what you show in the screen capture?
• What happens if there is a colspan? https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#colspan