Create standalone documentation

[aweary]

The current README isn't great. I'd love to have an actual website for documentation with examples, tutorials, API reference, etc.

I'm leaning towards using https://docusaurus.io/. It looks easy to setup, and it's a Facebook product so dog-fooding is a plus.

[mwilc0x]

I'd be happy to lend a hand with this.

[p-adams]

What would be a good starting point @aweary?

[OlivierJM]

I have worked with docusaurus before, I would love to help too, I guess creating another repo for the separate documentation would be a good start and discussing what can be ported from the current ReadMe.
@mjw56 let me know when you get started on it, I can help