github/docs ? reverse-engineered prompt

Build me a documentation website for my project, one that's heavily inspired by the look and feel of docs.github.com. It needs to have a clean, professional layout with a good search bar and a left-hand sidebar for easy navigation through all the different articles and sections.

The most important feature is that the site should be completely driven by Markdown files. I want to have a content folder where I can just write and organize my .md files, and the site should automatically turn them into nicely formatted web pages. This will make it super easy for non-technical team members and open-source contributors to add or edit documentation without having to touch any code.

For the tech stack, let's use something modern and fast like Next.js with TypeScript. And please include a Docker setup so it's simple for anyone to get the site running on their local machine to preview changes.