Move wiki to static site generator

[pethron]

We’re thinking about migrating the wiki to https://docusaurus.io/
It seems a really nice and consistent project. Like this, the wiki will be moved to code and version control so everybody can contribute.

How’s that? Do you know a better alternative?
We're currently talking about this on slack, so feel free to join in the conversation.

[pethron]

Used mkdocs and live on https://noovolari.github.io/leapp/