docs: remove dartnode link

Author: zaunist

README.md

@@ -90,7 +90,7 @@ XUGOU 采用现代化的系统架构，包含以下组件：
 
 感谢以下赞助商支持 XUGOU 的开发：
 
-[![Powered by DartNode](https://dartnode.com/branding/DN-Open-Source-sm.png)](https://dartnode.com "Powered by DartNode - Free VPS for Open Source")
+[Cloudflare](https://www.cloudflare.com/)
 
 ## 📄 开源协议
 

README_EN.md

@@ -82,9 +82,6 @@ Sponsor me in any way you can:
   <a href="https://buymeacoffee.com/real_zaunist" target="_blank">
     <img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" width="200" height="51">
   </a>
-      <a href="https://buymeacoke.realyourdad.workers.dev/" target="_blank">
-      <img src="https://img.shields.io/badge/Buy_Me_A_Coke-FF5E5B?style=for-the-badge&logo=coca-cola&logoColor=white" alt="Buy Me A Coke" width="200" height="51" style="border-radius: 8px;" />
-    </a>
 </div>
 
 ## 🤝 Contribution
@@ -95,7 +92,7 @@ All forms of contributions are welcome, whether it's new features, bug fixes, or
 
 Thanks to the following sponsors for supporting the development of XUGOU:
 
-[![Powered by DartNode](https://dartnode.com/branding/DN-Open-Source-sm.png)](https://dartnode.com "Powered by DartNode - Free VPS for Open Source")
+[Cloudflare](https://www.cloudflare.com/)
 
 ## 📄 License