Create project documentation using GitHub Pages #150

Repository where to document the project:
https://github.com/github-insights/github-insights.github.io

We'll use GitHub Pages to host the free publicly available documentation:
https://pages.github.com

Consider using Material for MkDocs to build a clean documentation website with support for local search, ...
https://squidfunk.github.io/mkdocs-material

I expect at least a getting started guide.
How to start the Docker container, what configurations are there ... ?