Sphinx on ReadTheDocs

[SashankBhamidi]

docs/
├── conf.py
├── index.rst
├── installation.rst
├── usage/
│   ├── quickstart.rst
│   ├── calendars.rst
│   ├── events.rst
│   ├── tasks.rst
│   └── sync.rst
└── api/
    ├── client.rst
    ├── async_client.rst
    └── objects.rst

PyData theme. .readthedocs.yml at root. Python 3.12.

Port the existing JMAP docs from caldav.readthedocs.io/v3.0.0/jmap.html. Don't remove them from python-caldav until these are live.