If you are looking for the official Strapi documentation, it is available here

This documentation is a contributor documentation made for anyone that wants to contribute to the project.

To run the documentation website, follow the instructions below.

$ yarn

$ yarn start

This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.

$ yarn build

This command generates static content into the build directory and can be served using any static contents hosting service.