docs: Update project structure of Django tutorial
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### Check existing issues
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### Request
### Issue
The Django tutorial contains many iterations of `django hello world` in its project structure. User feedback has revealed that this project structure is very confusing for users, and it's difficult for them to understand and complete the tutorial at times because of the repeated instances.
For example: At one point in the tutorial, the user is invited to update a configuration in `~/django-hello-world/django_hello_world/django_hello_world/settings.py`. There have been a couple of users during UXR sessions who couldn't find the file.
Some of those `django hello world` instances cannot be avoided due to Django's setup scheme, but we do have control over one instance: the name of the tutorial project directory, which is currently `django-hello-world`.
### Proposal
Update the tutorial project directory to `django-tutorial`.
This change would align the Django tutorial with its counterpart in Charmcraft, in which this change has already been implemented. See https://github.com/canonical/charmcraft/pull/2574
This change would affect the following files:
* https://github.com/canonical/rockcraft/blob/main/docs/tutorial/django.rst
* https://github.com/canonical/rockcraft/blob/main/docs/tutorial/code/django/task.yaml
### Document location
https://github.com/canonical/rockcraft/blob/main/docs/tutorial/django.rst
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