Delete oss-gg directory

[FelixMalfait]

As per title

[greptile-apps]

PR Summary

This PR removes the entire 'oss-gg' directory containing community engagement challenges, quests, and participation records from the Twenty project.

• Deletes 16+ challenge files that tracked community contributions including blog posts, videos, designs, and development tasks
• Removes historical records of participant submissions and points earned through the gamification system
• Impacts documentation of integration guides with tools like n8n, Zapier, and Raycast
• Eliminates templates and schemas used for structured community contributions
• Consider archiving participant contributions and notifying active community members before removal

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