add arena new site blog (#127)

* add arena new site blog

* fix link

* fix link

blog/2024-09-20-arena-new-site.md

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+---
+title: "Announcing a New Site for Chatbot Arena"
+author: "LMSys Team"
+date: "Sep 20, 2024"
+previewImg: /images/blog/arena_new_site/graduation.png
+---
+
+We’re excited to share that Chatbot Arena now has its own dedicated website: [lmarena.ai](https://lmarena.ai) and [blog](https://blog.lmarena.ai)!
+
+You might be wondering why we’re making this change. Over the past year, with the incredible support of our community, Chatbot Arena has evolved into a mature ecosystem and platform. We believe it’s time for it to **graduate** and stand on its own. By giving Chatbot Arena its own platform, we aim to provide it with more independence and ensure its long-term growth.
+
+<img src="/images/blog/arena_new_site/graduation.png" style="display:block; margin-top: auto; margin-left: auto; margin-right: auto; margin-bottom: auto; width: 40%"></img>
+
+From day one, LMSys has been a research collective dedicated to a variety of projects, such as [Vicuna](https://lmsys.org/blog/2023-03-30-vicuna/), [Chatbot Arena](https://lmarena.ai), [SGLang](https://github.com/sgl-project/sglang), [S-LoRA](https://lmsys.org/blog/2023-11-15-slora/), [RouteLLM](https://lmsys.org/blog/2024-07-01-routellm/), and more — beyond just one initiative. Moving forward, LMSys will continue to serve as an incubator for new projects and as a platform for open research and development.
+
+On the new Chatbot Arena site, you’ll find the latest updates and blog posts. Importantly, Chatbot Arena will remain a close partner with LMSys. Looking ahead, we’re expanding the platform to evaluate frontier models, not only for chatbots but also in areas like coding, complex tasks, and red-teaming. Together, we are committed to advancing open systems and model evaluation.
+
+Thank you for being a part of this journey with us. We’re excited for what’s ahead and appreciate your continued support!
+
+Cheers,  
+The LMSys Team