Fix some incorrect links in docs (go-gitea#28191)

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.

ps: Are there any good methods to test this in local?

docs/content/administration/email-setup.zh-cn.md

@@ -55,7 +55,7 @@ PASSWD         = `password`
 
 要发送测试邮件以验证设置，请转到 Gitea > 站点管理 > 配置 > SMTP 邮件配置。
 
-有关所有选项的完整列表，请查看[配置速查表](doc/administration/config-cheat-sheet.zh-cn.md)。
+有关所有选项的完整列表，请查看[配置速查表](doc/administration/config-cheat-sheet.md)。
 
 请注意：只有在使用 TLS 或 `HOST=localhost` 加密 SMTP 服务器通信时才支持身份验证。TLS 加密可以通过以下方式进行：
 

docs/content/help/faq.en-us.md

@@ -39,7 +39,6 @@ If a bug fix is targeted on 1.20.1 but 1.20.1 is not released yet, you can get t
 
 To migrate from Gogs to Gitea:
 
-- [Gogs version 0.9.146 or less](installation/upgrade-from-gogs.md)
 - [Gogs version 0.11.46.0418](https://github.com/go-gitea/gitea/issues/4286)
 
 To migrate from GitHub to Gitea, you can use Gitea's built-in migration form.

docs/content/help/faq.zh-cn.md

@@ -41,7 +41,6 @@ menu:
 
 要从Gogs迁移到Gitea：
 
-- [Gogs版本0.9.146或更低](installation/upgrade-from-gogs.md)
 - [Gogs版本0.11.46.0418](https://github.com/go-gitea/gitea/issues/4286)
 
 要从GitHub迁移到Gitea，您可以使用Gitea内置的迁移表单。

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，