Update to Docusaurus 3 and big refactor

[seanparkross]

Description

Update to Docusaurus 3 and big refactor.

Quick Links 🚀

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[robertjdominguez]

Hey, @seanparkross 👋

Thanks for this PR! Since you changed docs files, our automated Action assigned Sean as your reviewer 🎉

Before Sean looks over the changes, we ask you to take care of a couple of items:

• Make sure you've checked over our PR guide on the wiki. It ensures you've done your due diligence on the basics: spelling, heading casings, etc.
• Sean will need a review from someone on your team to ensure your team-specific content is accurate. Once that's done, ping Sean on Slack, and he'll give a docs review 🔥
• Additionally, please check this box to confirm your feature works as expected when using the documentation you've written. This is critical to ensuring our users have the information they need.

The docs team aims to get all PRs reviewed within 48 hours of your team doing a review in the form of a content pass. Let Sean know the level of urgency on Slack 👍

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