Nitro does not have a hello_django.py - all other supported frameworks have demos

[rxm7706]

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Nitro documentation includes django as integration framework.

• https://github.com/h2oai/nitro/tree/main/py/pkg
  There are sample cookbooks for all frameworks except django
• https://github.com/h2oai/nitro/blob/main/py/demo/hello_flask.py

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Provide a demo using django framework - demo/hello_django.py

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