What's Changed
* feat(datasets): delete unused datasets instead of archiving them by marcklingen in https://github.com/langfuse/langfuse/pull/830
* feat(ui): improved/nested main navigation by marcklingen in https://github.com/langfuse/langfuse/pull/834
* feat(cloud): ask new users for referral source by marcklingen in https://github.com/langfuse/langfuse/pull/831
**Full Changelog**: https://github.com/langfuse/langfuse/compare/v1.30.1...v1.31.0