Remove hacktoberfest campaign

README.md

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-## Wren AI @ Hacktoberfest 2024 - Oct 1 till Oct 31
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-[Hacktoberfest 2024](https://hacktoberfest.com/) is here, and we're inviting developers of all levels to join our open-source community. Together, we'll build Wren AI as a friendly community for all. 
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-👉 Learn how to [Win Wren AI Exclusive Swag Pack & Holopin From Digital Ocean Rewards](https://getwren.ai/wren-ai-hacktoberfest-2024)!
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-[![image](https://github.com/user-attachments/assets/9048d701-a97b-4c6b-b3ed-fc636201f234)](https://getwren.ai/wren-ai-hacktoberfest-2024)
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 > Wren Engine is the semantic engine for LLMs, the backbone of the [Wren AI](https://github.com/Canner/WrenAI) project.
 
 <img src="./misc/wren_engine_flow.png">