Try building via binderbot

[brian-rose]

[github-actions[bot]]

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[brian-rose]

Showed this off briefly at the EWG today (9/26/2022).

This PR renders all the notebooks on a binder service rather than directly on GitHub actions.

• Install binderbot in the python environment on GitHub Actions
• Use binderbot to farm out the execution of all notebooks to an external Binder service
• The execution environment on that Binder service uses the environment.yml file on the main branch of this repo.
• Once all notebooks are executed on the Binder service, they are downloaded back to GitHub Actions with all their output.
• The jupyter-book build process then takes over and creates the rendered book
• set execute_notebooks: 'off' in the jupyter-book config file since the notebooks are already executed.

[brian-rose]

Latest pushes here use a more bare-bones conda environment on GitHub Actions that includes just enough to call binderbot and call jupyter-book build.

With this approach, there's no need to create a full conda environment with all the science packages since we don't execute any notebook code.

[brian-rose]

I'll leave this open for demo purposes for now, but once #339 is merged there will be a much simpler way to call binderbot.

[brian-rose]

This is obsolete. I'll open a new PR that demos running the build via binderbot using the updated Cookbook infrastructure.