404-page is broken about website HOT 1 CLOSED

I found a relative issue of mkdocs: mkdocs/mkdocs#1039

An error page can be served from any location and therefore it is
impossable to pre-build an error page with correct relative URLs.
With absolute URLs, the error pages will properly link to other
pages in the nav as well as media files (css, js, images, etc) from
the template regardless of the actual URL the file is served from.

However, to continue to support environments where the docs root is a subdir
of the server root, all other pages must continue to use relative URLs.
The site_url is used to determine the server root when building
absolute URLs for the error page to ensure those URLs continue to work
in that type of environment.

And I also found that our site_url is https://kserve.io/docs, I think that we must replace it https://kserve.io/website!
https://github.com/kserve/website/blob/main/mkdocs.yml#L78

from website.