Docs Quick tip: share slugify filter with Markdown TOC

[zachleat]

First noticed it on here but it’s a good idea: https://twitter.com/codingsafari/status/1410682849473277961

Highly related to 11ty/eleventy#278 and the new slugify replacement.

[zachleat]

This repository is now using lodash style issue management for documentation requests. This means documentation issues will now be closed instead of leaving them open.

View the documentation queue backlog here. Don’t forget to upvote the top comment with 👍!

[pdehaan]

That's a neat trick!

Bonus points if we can use the eleventyConfig.getFilter("slug") API instead of eleventyConfig.javascriptFunctions.slug.