Docusaurus initial commit

[cblackcom]

For your review: https://cblackcom.github.io/virtual

Like it love it hate it? lmk.

If you want to roll with it and deploy it to https://kendfinger.github.io/virtual, accept this PR into a new "docs" branch on your end, then I can push you a separate PR with the gh-files branch, or you can compile yourself (docusaurus/README.md).

Alternatively, we could close the PR on this repo and create a separate repo for this documentation site, likely with its own CNAME...

[azenla]

This looks fantastic, I will merge this as soon as I can!