`django-ninja` compatibility docs

[Archmonger]

Current Situation

It may be unclear to users how to use this framework with Django Ninja.

Proposed Actions

Create some documentation showing how to integrate with Django Ninja.

[Archmonger]

I dug into Django Ninja, and it looks like it requires a full-fledged Django environment.

Ninja just exists as an extra HTTP endpoint, so there are zero modifications needed to the existing docs.

Will need @paolodina and @jensenbox to chime in on what confusion currently exists. Is it related to how to send/receive queries from Ninja API endpoints within ReactPy-Django?

Will be closing this issue until I hear some feedback.