Backport #28191 by @yp05327
https://gitea.com/gitea/gitea-docusaurus/actions/runs/661/jobs/0#jobstep-9-39
I noticed that there are many warning logs in building docs.
It is causing 404 in docs.gitea.com now, so we need to fix it.
And there are also some other problems in v1.19 which can not be done in
this PR.
Co-authored-by: yp05327 <576951401@qq.com>
(cherry picked from commit 4b89c0f996)