This site uses Hugo. Hugo is a “static site generator” which means you write a bunch of markdown and it generates html. This is great for building simple sites like company leafletware or blogs.
You can get Hugo across platforms and on Windows it’s just an executable you can put in your program files. You can then work with it like git in the command line.
Read on for a step-by-step process to get started. Steph also links to blogdown, which is an interesting R-friendly extension.