Additions
- Add `at_random` method to `BaseEnum` for generating an enum variant at random.
- Add `levels` property to `CompetitionParticipationDetail`.
- Add `patron`, `banner_image`, and `profile_image` properties to `Group`.
- Add `SocialLinks` model and `social_links` property to `GroupDetail`.
- Add getting started guide to the documentation.
Changes
- Methods that previously accepted only `GroupMemberFragment` now accept strings as well.
- Update examples in `GroupService` that work with `GroupMemberFragment`.
- Remove usage of weakref slots throughout the project, improving memory footprint.
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