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update arxiv link

README.md

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 <h1>villa-X: A Vision-Language-Latent-Action Model</h1>
 
-[![arXiv](https://img.shields.io/badge/arXiv-Paper-red?logo=arxiv&logoColor=white)](./) &ensp; [![Project](https://img.shields.io/badge/Project-Page-blue?logo=homepage&logoColor=white)](https://microsoft.github.io/villa-x) &ensp; [![Code](https://img.shields.io/badge/GitHub-Code-blue?logo=github&logoColor=white)](https://github.com/microsoft/villa-x/)
+[![arXiv](https://img.shields.io/badge/arXiv-Paper-red?logo=arxiv&logoColor=white)](https://arxiv.org/abs/2507.23682) &ensp; [![Project](https://img.shields.io/badge/Project-Page-blue?logo=homepage&logoColor=white)](https://microsoft.github.io/villa-x) &ensp; [![Code](https://img.shields.io/badge/GitHub-Code-blue?logo=github&logoColor=white)](https://github.com/microsoft/villa-x/)
 </div>
 
 ## How to use