docusaurus pipeline

[nicolasochem]

Set up a docs folder in this repo and a docusaurus build pipeline that deploys the contents of the docs folder into a static webpage hosted by github.

The goal is to break out the README file into more detailed documentation split in sections (private chain, private node etc)

[orcutt989]

@nicolasochem @harryttd I'm not familiar with docusaurus. Are there example sites I could take a look at?

[nicolasochem]

https://docs.flashbots.net/
https://docs.prylabs.network/docs/getting-started/

[orcutt989]

#426