Fix some incorrect links in docs (#28191) (#28201)

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)

docs/content/usage/actions/act-runner.en-us.md

@@ -114,7 +114,7 @@ If you cannot see the settings page, please make sure that you have the right pe
 
 The format of the registration token is a random string `D0gvfu2iHfUjNqCYVljVyRV14fISpJxxxxxxxxxx`.
 
-A registration token can also be obtained from the gitea [command-line interface](../../administration/command-line.en-us.md#actions-generate-runner-token):
+A registration token can also be obtained from the gitea [command-line interface](../../administration/command-line.md#actions-generate-runner-token):
 
 ```
 gitea --config /etc/gitea/app.ini actions generate-runner-token

docs/content/usage/actions/act-runner.zh-cn.md

@@ -113,7 +113,7 @@ Runner级别决定了从哪里获取注册令牌。
 
 注册令牌的格式是一个随机字符串 `D0gvfu2iHfUjNqCYVljVyRV14fISpJxxxxxxxxxx`。
 
-注册令牌也可以通过 Gitea 的 [命令行](../../administration/command-line.en-us.md#actions-generate-runner-token) 获得:
+注册令牌也可以通过 Gitea 的 [命令行](../../administration/command-line.md#actions-generate-runner-token) 获得:
 
 ### 注册Runner
 

docs/content/usage/authentication.en-us.md

@@ -198,7 +198,7 @@ administrative user.
     field is set to `mail.com`, then Gitea will expect the `user email` field
     for an authenticated GIT instance to be `gituser@mail.com`.[^2]
 
-**Note**: PAM support is added via [build-time flags](installation/install-from-source.md#build),
+**Note**: PAM support is added via [build-time flags](installation/from-source.md#build),
 and the official binaries provided do not have this enabled.  PAM requires that
 the necessary libpam dynamic library be available and the necessary PAM
 development headers be accessible to the compiler.

docs/content/usage/authentication.zh-cn.md

@@ -162,7 +162,7 @@ PAM提供了一种机制，通过对用户进行PAM认证来自动将其添加
     - PAM电子邮件域:用户认证时要附加的电子邮件后缀。例如，如果登录系统期望一个名为gituse的用户，
   并且将此字段设置为mail.com，那么Gitea在验证一个GIT实例的用户时将期望user emai字段为gituser@mail.com[^2]。
 
-**Note**: PAM 支持通过[build-time flags](installation/install-from-source.md#build)添加,
+**Note**: PAM 支持通过[build-time flags](installation/from-source.md#build)添加,
 而官方提供的二进制文件通常不会默认启用此功能。PAM需要确保系统上有必要的libpam动态库，并且编译器可以访问必要的PAM开发头文件。
 
 [^1]: 例如，在Debian "Bullseye"上使用标准Linux登录，可以使用`common-session-noninteractive`。这个值对于其他版本的Debian，