docs: update logo image in README.md

README.md

 <div align="center" id="nunchaku_logo">
-  <img src="https://huggingface.co/datasets/nunchaku-tech/cdn/resolve/main/nunchaku/assets/nunchaku_v2.png" alt="logo" width="220"></img>
+  <img src="https://huggingface.co/datasets/nunchaku-tech/cdn/resolve/main/logo/v2/nunchaku-compact-transparent.png" alt="logo" width="220"></img>
 </div>
 <h3 align="center">
 <a href="http://arxiv.org/abs/2411.05007"><b>Paper</b></a> | <a href="https://nunchaku.tech/docs/nunchaku/"><b>Docs</b></a> | <a href="https://hanlab.mit.edu/projects/svdquant"><b>Website</b></a> | <a href="https://hanlab.mit.edu/blog/svdquant"><b>Blog</b></a> | <a href="https://svdquant.mit.edu"><b>Demo</b></a> | <a href="https://huggingface.co/nunchaku-tech"><b>Hugging Face</b></a> | <a href="https://modelscope.cn/organization/nunchaku-tech"><b>ModelScope</b></a> | <a href="https://github.com/nunchaku-tech/ComfyUI-nunchaku"><b>ComfyUI</b></a>