[Docs] Fix blog url

[Leetfs]

[Copilot]

Pull Request Overview

This PR updates the blog link in the introductory docs to point to the live site.

• Replaces a relative /blog/index link with the absolute https://www.travellings.cn/blog/ URL.

Comments suppressed due to low confidence (1)

docs/toyou.md:3

• [nitpick] Consider replacing "开往" with "前往" for more natural phrasing in Chinese.

+如果你想加入维护组，可以查看开往[博客](https://www.travellings.cn/blog/)，通过页面底部文章作者查看最近活跃的维护者。这里是一些开发规范和开发理念，便于新的维护者加入。