Here's a shiny new new project from Vue's creator. There are plenty of static site generators in the wild, but most of them are created with blogging or generic content in mind. VuePress has a specific angle:
VuePress is composed of two parts: a minimalistic static site generator with a Vue-powered theming system, and a default theme optimized for writing technical documentation. It was created to support the documentation needs of Vue’s own sub projects.
The default theme looks great (no surprise there) and the supporting documentation/story telling around VuePress is quite impressive as well. But perhaps you're wondering, "Why not $X?", where $X is a similar alternative. Here's why.