Update README.md

Author: evison

README.md

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 [![Gurubase](https://img.shields.io/badge/Gurubase-Ask%20AIOS%20Guru-006BFF)](https://gurubase.io/g/aios)
 
 <a href="https://trendshift.io/repositories/8908" target="_blank"><img src="https://trendshift.io/api/badge/repositories/8908" alt="agiresearch%2FAIOS | Trendshift" style="width: 250px; height: 55px;" width="250" height="55"/></a>
-<a href="https://give.rutgersfoundation.org/aios-project/23717.html" target="_blank"><img src="https://trendshift.io/api/badge/repositories/8908" alt="Sponsor" style="width: 250px; height: 55px;" width="250" height="55"/></a>
+<a href="https://give.rutgersfoundation.org/aios-project/23717.html" target="_blank"><img src="docs/assets/sponsor.png" alt="Sponsor" style="width: 250px; height: 55px;" width="250" height="55"/></a>
 
 AIOS is the AI Agent Operating System, which embeds large language model (LLM) into the operating system and facilitates the development and deployment of LLM-based AI Agents. AIOS is designed to address problems (e.g., scheduling, context switch, memory management, storage management, tool management, Agent SDK management, etc.) during the development and deployment of LLM-based agents, towards a better AIOS-Agent ecosystem for agent developers and agent users. AIOS includes the AIOS Kernel (this [AIOS](https://github.com/agiresearch/AIOS) repository) and the AIOS SDK (the [Cerebrum](https://github.com/agiresearch/Cerebrum) repository). AIOS supports both Web UI and Terminal UI.