Set the default type for implicit primary keys

David Rungerequested to merge
dvzrv/hyperkitty:default_auto_field into master

example_project/settings.py: Set DEFAULT_AUTO_FIELD in the example project's settings to silence warnings. The feature has been introduced with django 3.2: https://docs.djangoproject.com/en/3.2/releases/3.2/#customizing-type-of-auto-created-primary-keys

Relates to #401 (closed)

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