[Feature Request] Switch Theme on the Official Website Homepage

[yutingzhao1991]

[github-actions]

Hello @yutingzhao1991. We totally like your proposal/feedback, welcome to send us a Pull Request for it. provide changelog/documentation/test cases if needed and make sure CI passed, we will review it soon. We appreciate your effort in advance and looking forward to your contribution!

你好 @yutingzhao1991，我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。提供改动所需相应的 changelog、测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献。

[kiner-tang]

这个我来搞一下吧