New docs integrated into github workflows

[daurer]

The goal is to create a new documentation page with better API reference but also copying over features from old documentation page.

Use a fork to implement these changes

• Create backbone sphinx documentation
• Build current docs with Github actions
• Move current docs to subdomain
• Add new docs to Github actions on different subdomain

Once happy with all of the above, can merge upstream and continue developing the new docs while old docs are still available.