Documentation contains broken links

Describe the bug

On any page of the LoopBack 4 website, links to any API Docs page are broken. Evidence of the last time this was working correctly is the last good capture by the The Internet Archive (Wayback Machine) was March 22, 2022: https://web.archive.org/web/20230322024014/https://loopback.io/doc/en/lb4/apidocs.index.html

Here is just one example:
On the LoopBack 4 Home Page select API DOCS from the main menu, then LoopBack 4 from the dropdown menu; this navigates to: https://loopback.io/doc/en/lb4/apidocs.index.html; but displays:

Page Not Found
[ Edit this page](https://github.com/strongloop/loopback.io/blob/gh-pages/pages/404.md)
Sorry, but the page you were trying to view does not exist. 

This is similar to another this bug I reported which was never resolved: https://github.com/loopbackio/loopback-next/issues/8990

Logs

No response

Additional information

No response

Reproduction

N/A

从 LoopBack 4 Home Page 的 API DOCS 菜单开始，将其 LoopBack 4 目标与报告中的 apidocs.index.html URL 进行比较。检查链接页面/404.md 的上下文，以及生成损坏链接的文档导航。完成标准是 API Docs 菜单能够到达现有的 API Docs 页面，而不是 Page Not Found。