将官网链接替换为 theme-next.js.org

[TripleCamera]

Please follow this Issue template to provide relevant information, such as source code repositories, blog links, and screenshots, which will help us investigate. 请按照此 Issue 模版提供相关信息，例如源码仓库、博客链接和屏幕截图，这将有助于我们进行调查。

Issue Checklist

• [x] I am using the latest version of NexT.
• [x] I have read the relevant documents of Hexo and NexT.
• [x] I have reviewed the latest Roadmap on GitHub and searched for current issues, which does not help me.

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请将本仓库的官网链接（包括右上角和 README 中的链接）由 https://theme-next.org/ 替换为 https://theme-next.js.org/，这误导了很多人，包括我。

Other Information

[welcome[bot]]

Thanks for opening this issue, maintainers will get back to you as soon as possible!

[TripleCamera]

我错了。这个项目已经迁移到 next-theme/hexo-theme-next 了。