Removing live examples of tutorial code that are no longer hosted #9363
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Description
1. The tutorial code in the official documentation is no longer hosted in the sandbox, so I've removed that reference from the official documentation.
Closes #8887
Refs #9357
(before the change)
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(after the change)
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2. minor change, DRF now supports Django 5.0. I've updated the parts of the documentation where Django 4.0 is used to 5.0.
(before the change)
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(after the change)
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3. minor concern... The source code for the tutorial is currently using DRF 3.11. I think it would be nice to use a tool like dependabot to ensure that the code in the tutorial follows the latest version of DRF (even if there is very little difference in behavior between DRF 3.11 and 3.15).