GHA: Add action to build docs.

[carltongibson]

• On main.
• install requirements.
• make json
• Upload artifact.

Then fetch artifact to update on server. (Webhook.)

[eduzen]

hey @carltongibson, I'm willing to help with this issue. But I was wondering how to install dependencies first. I saw that you have them in pyproject.toml, so I'm assuming that pip-compile pyproject.toml --output-file requirements.txt is the first thing to do. Can I assume this for the pr? And also requirements?

[carltongibson]

Hi @eduzen. Installing the docs dependency with pip should be enough:

$ pip install -e .[docs]

[eduzen]

Thanks, @carltongibson, you are right! I updated the status of the pr