Rethink website publishing so that website describes stable release, not unreleased changes on master

[cspotcode]

Not sure the best way to do this. The website should describe the stable release on npm, not unreleased changes on master.

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2x goals:

• a) We want to be able to fix, improve the website docs and re-publish without an npm release
• b) But we also want to be able to update docs alongside a new feature implementation, and merge that feature to master without breaking the website.

One solution is to forget about doing a)

The other is to keep either 2x directories or 2x branches of docs:

• one to describe stable npm release
• the other to describe new features

Doing this with branches is probably the easiest. Merge master -> docs branch, then run the docusaurus build on the docs branch. Docs updates can be made as PRs directly against the docs branch, not master.

However, that might not play nice with the docusaurus "Edit" button? Do we care?