Docusaurus-ify (#26051)

This PR cleans up the docs in a way to make them simpler to ingest by
our [docs repo](https://gitea.com/gitea/gitea-docusaurus).

1. It includes all of the sed invocations our ingestion did, removing
the need to do it at build time.
2. It replaces the shortcode variable replacement method with
`@variable@` style, simply for easier sed invocations when required.
3. It removes unused files and moves the docs up a level as cleanup.

---------

Signed-off-by: jolheiser <john.olheiser@gmail.com>

docs/content/administration/git-lfs-support.zh-cn.md

@@ -0,0 +1,32 @@
+---
+date: "2023-05-23T09:00:00+08:00"
+title: "Git LFS 设置"
+slug: "git-lfs-setup"
+sidebar_position: 12
+toc: false
+draft: false
+aliases:
+  - /zh-cn/git-lfs-setup
+menu:
+  sidebar:
+    parent: "administration"
+    name: "Git LFS 设置"
+    sidebar_position: 12
+    identifier: "git-lfs-setup"
+---
+
+# 配置 Git 大文件存储（Large File Storage，LFS）
+
+要使用 Gitea 内置的 LFS 支持，您需要更新 `app.ini` 文件：
+
+```ini
+[server]
+; 启用 git-lfs 支持。true 或 false，默认为 false。
+LFS_START_SERVER = true
+
+[lfs]
+; 存放 LFS 文件的路径，默认为 data/lfs。
+PATH = /home/gitea/data/lfs
+```
+
+**注意**：LFS 服务器支持需要服务器上安装 Git v2.1.2 以上版本。