Although previous config worked locally, it turns out it isn't compatible with now.sh.
It turns out when deploying from a subdir (like 'www') on now.sh the contents of the parent directory isn't avalible.
* Now has 'www' directory at root level for the website (was 'docs').
* The 'docs' directory now only contains Markdown docs.
* Docusarus config looks in '../docs' for the docs.
This is deployed with now.sh to https://next-auth-docs.now.sh
