Restructure documentation. Now the documentation has installation, administration, usage, development, contributing the 5 main parts (#23629)

- **Installation**: includes how to install Gitea and related other
tools, also includes upgrade Gitea
- **Administration**: includes how to configure Gitea, customize Gitea
and manage Gitea instance out of Gitea admin UI
- **Usage**: includes how to use Gitea's functionalities. A sub
documentation is about packages, in future we could also include CI/CD
and others.
- **Development**: includes how to integrate with Gitea's API, how to
develop new features within Gitea
- **Contributing**: includes how to contribute code to Gitea
repositories.

After this is merged, I think we can have a sub-documentation of `Usage`
part named `Actions` to describe how to use Gitea actions

---------

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

docs/content/doc/contributing/localization.zh-cn.md

@@ -0,0 +1,32 @@
+---
+date: "2016-12-01T16:00:00+02:00"
+title: "本地化"
+slug: "localization"
+weight: 10
+toc: false
+draft: false
+menu:
+  sidebar:
+    parent: "contributing"
+    name: "本地化"
+    weight: 20
+    identifier: "localization"
+---
+
+# 本地化
+
+Gitea的本地化是通过我们的[Crowdin项目](https://crowdin.com/project/gitea)进行的。
+
+对于对**英语翻译**的更改，可以发出pull-request，来更改[英语语言环境](https://github.com/go-gitea/gitea/blob/master/options/locale/locale_en-US.ini)中合适的关键字。
+
+有关对**非英语**翻译的更改，请参阅上面的 Crowdin 项目。
+
+## 支持的语言
+
+上述 Crowdin 项目中列出的任何语言一旦翻译了 25% 或更多都将得到支持。
+
+翻译被接受后，它将在下一次 Crowdin 同步后反映在主存储库中，这通常是在任何 PR 合并之后。
+
+在撰写本文时，这意味着更改后的翻译可能要到 Gitea 的下一个版本才会出现。
+
+如果使用开发版本，则在同步更改内容后，它应该会在更新后立即显示。