New document (#5299)

* add new doc (#5175)

Co-authored-by: dreamer6680 <146868355@qq.com>

* Test docs (#5235)

* fix: change the page of doc

* chore: add new dependencies, update global styles/layout, optimize docs, add Feishu & GitHub icons, update API examples

* fix: docs/index 404 not found

* Update environment variable names, optimize styles, add new API routes, fix component styles, adjust documentation, and update GitHub and Feishu icons

* update readme

* feat: add a linkfastgpt compontent

* feat: update new doc

* fix:remove unuse page and redirect homepage to docs (#5288)

* fix：remove some unuse doc

* fix: redirect homepage to doc

* git ignore

* fix:navbar to index (#5295)

* sidbar

* fix: navtab unlight (#5298)

* doc

---------

Co-authored-by: dreamer6680 <1468683855@qq.com>
Co-authored-by: dreamer6680 <146868355@qq.com>

document/content/docs/introduction/development/upgrading/43.mdx

@@ -0,0 +1,26 @@
+---
+title: 升级到 V4.3(包含升级脚本)
+description: FastGPT 从旧版本升级到 V4.3 操作指南
+---
+
+## 执行初始化 API
+
+发起 1 个 HTTP 请求 (记得携带 `headers.rootkey`，这个值是环境变量里的)
+
+1. https://xxxxx/api/admin/initv43
+
+```bash
+curl --location --request POST 'https://{{host}}/api/admin/initv43' \
+--header 'rootkey: {{rootkey}}' \
+--header 'Content-Type: application/json'
+```
+
+会给 PG 数据库的 modeldata 表插入一个新列 file_id，用于存储文件 ID。
+
+## 增加环境变量
+
+增加一个 `FILE_TOKEN_KEY` 环境变量，用于生成文件预览链接，过期时间为 30 分钟。
+
+```
+FILE_TOKEN_KEY=filetokenkey
+```