Revise installation instructions in README

Updated installation command and removed outdated references.

Author: wanghe-fit2cloud

README.md

@@ -44,13 +44,9 @@
 Execute the script below and follow the prompts to install 1Panel:
 
 ```bash
-curl -sSL https://resource.1panel.pro/quick_start.sh -o quick_start.sh && bash quick_start.sh
+bash -c "$(curl -sSL https://resource.fit2cloud.com/1panel/package/v2/quick_start.sh)"
 ```
 
-Please refer to our [documentation](https://docs.1panel.pro/quick_start/) for more details.
-
-中国用户请使用这个 [安装脚本](https://1panel.cn/docs/installation/online_installation/)，其应用数量比国际版本更丰富。
-
 ## Screenshot
 
 ![UI Display](https://resource.1panel.pro/img/1panel.png)