GitbookIO/gitbook ? reverse-engineered prompt

I'd like to build a self-hosted frontend for our technical documentation. We already use GitBook to write and manage our content, so this application should be able to render any public GitBook space by just pointing to its URL.

The layout should be a clean, modern recreation of the standard GitBook interface. It needs a collapsible navigation sidebar on the left for topics and the main content area on the right. A powerful search bar at the top that lets users quickly find information is essential. The whole experience should feel really fast, with smooth animations for UI elements.

It should also support translations for UI text like "Next" and "Previous" buttons. Build it with Next.js and Tailwind CSS so it's performant and easy for us to customize the visual theme later on.