Move static files to static/cloudinary

[salomvary]

Django recommends [1] storing static files under a folder matching the app name, eg. my_app/static/my_app/example.jpg.

Why is this useful? Because all static folders from all apps will be merged into a unified static folder and file names might collide from different apps.

It is also useful to be able to tell which app shipped js/jquery.ui.widget.js so that the --ignore PATTERN flag of the collectstatic command can efficiently be targeted at certain apps.

[1] https://docs.djangoproject.com/en/4.0/howto/static-files/#configuring-static-files

Brief Summary of Changes

What does this PR address?

• [ ] GitHub issue (Add reference - #XX)
• [x] Refactoring
• [ ] New feature
• [ ] Bug fix
• [ ] Adds more tests

Are tests included?

• [ ] Yes
• [x] No

Reviewer, please note:

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I ran the full test suite before pushing the changes and all the tests pass.

One seemingly unrelated test fails, but it also fails on master:

ERROR: setUpClass (test.test_uploader.UploaderTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "pycloudinary/test/test_uploader.py", line 111, in setUpClass
    api.add_metadata_field({
  File "pycloudinary/cloudinary/api.py", line 536, in add_metadata_field
    return call_metadata_api("post", [], params, **options)
  File "pycloudinary/cloudinary/api_client/call_api.py", line 22, in call_metadata_api
    return call_json_api(method, uri, params, **options)
  File "pycloudinary/cloudinary/api_client/call_api.py", line 27, in call_json_api
    return _call_api(method, uri, body=data, headers={'Content-Type': 'application/json'}, **options)
  File "pycloudinary/cloudinary/api_client/call_api.py", line 53, in _call_api
    return execute_request(http_connector=_http,
  File "pycloudinary/cloudinary/api_client/execute_request.py", line 84, in execute_request
    raise exception_class("Error {0} - {1}".format(response.status, result["error"]["message"]))
cloudinary.exceptions.AuthorizationRequired: Error 401 - unknown api_key