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just-the-docs
A modern, high customizable, responsive Jekyll theme for documentation with built-in search.
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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.
If it can help, there was a commenter earlier who suggested trying out a Doc-style github page that you can easily fork. It also has its own built-in search. Comment here. Github page here.
Or any other markdown editor, such as Obsidian or Zettlr, for doing it on your computer. If you can type, you can create a hyperlinked document/web page. markdown editors usually can export both as PDF and a web page (HTML)
GitBook is just for that; making hyperlinked documentation available online. You just type in your rules and hyperlink them, using the online in-browser editor.
Or any other markdown editor, such as Obsidian or Zettlr, for doing it on your computer. If you can type, you can create a hyperlinked document/web page. markdown editors usually can export both as PDF and a web page (HTML)