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-tw.md

@@ -0,0 +1,32 @@
+---
+date: "2016-12-01T16:00:00+02:00"
+title: "在地化"
+slug: "localization"
+weight: 10
+toc: false
+draft: false
+menu:
+  sidebar:
+    parent: "contributing"
+    name: "在地化"
+    weight: 20
+    identifier: "localization"
+---
+
+# 在地化
+
+我們在 [Crowdin 專案](https://crowdin.com/project/gitea)上進行在地化工作。
+
+**英語系**的翻譯，可在修改[英文語言檔](https://github.com/go-gitea/gitea/blob/master/options/locale/locale_en-US.ini)後提出合併請求。
+
+**非英語系**的翻譯，請前往上述的 Crowdin 專案。
+
+## 已支援的語言
+
+上述 Crowdin 專案中列出的語言在翻譯超過 25% 後將被支援。
+
+翻譯被認可後將在下次 Crowdin 同步後進入到主儲存庫，通常是在任何合併請求被合併之後。
+
+這表示更改的翻譯要到下次 Gitea 發佈後才會出現。
+
+如果您使用的是最新建置，它將會在同步完成、您更新後出現。