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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Algolia DocSearch maintains a separate config repo for all their customers. If you want to update your config, you'll need to find it in their repo and submit a PR (with some info that you are, in fact, involved with the documentation project you are updating).
I mention this because I wasn't in my role (or at this company) when the engineers decided to move forward with Docusaurus, a React-based documentation framework. I think the choice they made was reasonable, probably the choice I would have made if I was in their shoes, but not the choice I would have likely made today.