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/administration/backup-and-restore.zh-cn.md

@@ -0,0 +1,66 @@
+---
+date: "2018-06-06T09:33:00+08:00"
+title: "使用：备份与恢复"
+slug: "backup-and-restore"
+weight: 11
+toc: false
+draft: false
+menu:
+  sidebar:
+    parent: "administration"
+    name: "备份与恢复"
+    weight: 11
+    identifier: "backup-and-restore"
+---
+
+# 备份与恢复
+
+Gitea 已经实现了 `dump` 命令可以用来备份所有需要的文件到一个zip压缩文件。该压缩文件可以被用来进行数据恢复。
+
+## 备份命令 (`dump`)
+
+先转到git用户的权限: `su git`. 再Gitea目录运行 `./gitea dump`。一般会显示类似如下的输出：
+
+```
+2016/12/27 22:32:09 Creating tmp work dir: /tmp/gitea-dump-417443001
+2016/12/27 22:32:09 Dumping local repositories.../home/git/gitea-repositories
+2016/12/27 22:32:22 Dumping database...
+2016/12/27 22:32:22 Packing dump files...
+2016/12/27 22:32:34 Removing tmp work dir: /tmp/gitea-dump-417443001
+2016/12/27 22:32:34 Finish dumping in file gitea-dump-1482906742.zip
+```
+
+最后生成的 `gitea-dump-1482906742.zip` 文件将会包含如下内容：
+
+* `custom` - 所有保存在 `custom/` 目录下的配置和自定义的文件。
+* `data` - 数据目录下的所有内容不包含使用文件session的文件。该目录包含 `attachments`, `avatars`, `lfs`, `indexers`, 如果使用sqlite 还会包含 sqlite 数据库文件。
+* `gitea-db.sql` - 数据库dump出来的 SQL。
+* `gitea-repo.zip` - Git仓库压缩文件。
+* `log/` - Logs文件，如果用作迁移不是必须的。
+
+中间备份文件将会在临时目录进行创建，如果您要重新指定临时目录，可以用 `--tempdir` 参数，或者用 `TMPDIR` 环境变量。
+
+## Restore Command (`restore`)
+
+当前还没有恢复命令，恢复需要人工进行。主要是把文件和数据库进行恢复。
+
+例如：
+
+```sh
+unzip gitea-dump-1610949662.zip
+cd gitea-dump-1610949662
+mv data/conf/app.ini /etc/gitea/conf/app.ini
+mv data/* /var/lib/gitea/data/
+mv log/* /var/lib/gitea/log/
+mv repos/* /var/lib/gitea/repositories/
+chown -R gitea:gitea /etc/gitea/conf/app.ini /var/lib/gitea
+
+# mysql
+mysql --default-character-set=utf8mb4 -u$USER -p$PASS $DATABASE <gitea-db.sql
+# sqlite3
+sqlite3 $DATABASE_PATH <gitea-db.sql
+# postgres
+psql -U $USER -d $DATABASE < gitea-db.sql
+
+service gitea restart
+```