refactor: rename i18n/*/docusaurus-plugin-content-docs to i18n/*/docs (#588)

Drops the leftover docusaurus name from the translated content directories.

- git mv i18n/{en-us,zh-cn,zh-tw}/docusaurus-plugin-content-docs -> i18n/{locale}/docs (pure renames, content unchanged)
- update the paths in packages/content-loader/src/products.ts, scripts/cut-version.mjs and sites/docs/README.md

current.json / version-*.json keep their names and stay beside the content.

Verified: pnpm build succeeds, 6690 pages built.

<!-- cloudflare-preview --> Preview: https://pr-588.docs-gitea-com.pages.dev
Reviewed-on: https://gitea.com/gitea/docs/pulls/588
Reviewed-by: Zettat123 <[email protected]>

i18n/zh-cn/docs/version-28/development/integrations.md

@@ -0,0 +1,37 @@
+---
+date: "2023-05-25T17:29:00+08:00"
+slug: "integrations"
+sidebar_position: 65
+aliases:
+  - /zh-cn/integrations
+---
+
+# 集成
+
+Gitea 拥有一个出色的第三方集成社区，以及在其他各种项目中的一流支持。
+
+我们正在[awesome-gitea](https://gitea.com/gitea/awesome-gitea)上整理一个列表来跟踪这些集成！
+
+如果你正在寻找[CI/CD](https://gitea.com/gitea/awesome-gitea#user-content-devops)，
+一个[SDK](https://gitea.com/gitea/awesome-gitea#user-content-sdk)，
+甚至一些额外的[主题](https://gitea.com/gitea/awesome-gitea#user-content-themes)，
+你可以在[awesome-gitea](https://gitea.com/gitea/awesome-gitea)中找到它们的列表！
+
+## 预填新文件名和内容
+
+如果你想打开一个具有给定名称和内容的新文件，
+你可以使用查询参数来实现：
+
+```txt
+GET /{{org}}/{{repo}}/_new/{{filepath}}
+    ?filename={{filename}}
+    &value={{content}}
+```
+
+例如：
+
+```txt
+GET https://git.example.com/johndoe/bliss/_new/articles/
+    ?filename=hello-world.md
+    &value=Hello%2C%20World!
+```