chore: Docusaurus with webpack 5

[slorber]

Use an unreleased version of Docusaurus to test the webpack5 support works for this site.

See also facebook/docusaurus#4089

Note: I'm not sure to understand how Netlify is set-up, you may want to cache the webpack5 cache with a similar config than reduxjs/redux#4067

[netlify]

Deploy preview for react-redux-docs ready!

Built with commit 2ea2d7a

https://deploy-preview-1714--react-redux-docs.netlify.app

[timdorr]

Poked at some bad front matter for you. Not sure why GitHub is continually asking me to approve your builds, as I'd figure it would remember the first time I say it's good.

LGTM

[slorber]

thanks

we recently added a more strict validation of frontmatter, do you think we should allow empty sidebar_label like before? What was the intention? Also why your first fix didn't work?

[timdorr]

It didn't fall back to the title in the first fix. You can check out that revision and build it locally to see for yourself. Might be worth a bug fix.

As for the expected behavior, I'd say null should behave similarly to undefined. That feels the most natural to me. I'm not sure why someone would add sidebar_label without filling it in, but that seems like a reasonable fallback.

[slorber]

thanks for the feedback :)

Let me know if I can do anything else for this PR