Docs: update weight (#290)

Signed-off-by: Carson Yang <yangchuansheng33@gmail.com>

docSite/content/docs/use-cases/_index.md

@@ -1,5 +1,5 @@
 ---
-weight: 100
+weight: 300
 title: '使用案例'
 description: '有关 FastGPT 其他实践案例的更多信息'
 icon: 'cases'

docSite/content/docs/use-cases/kb.md

@@ -4,7 +4,7 @@ description: " 利用 FastGPT 打造高质量 AI 知识库"
 icon: "school"
 draft: false
 toc: true
-weight: 640
+weight: 340
 ---
 
 ## 前言

docSite/content/docs/use-cases/onwechat.md

@@ -4,7 +4,7 @@ description: "FastGPT 对接 OnWeChat"
 icon: "chat"
 draft: false
 toc: true
-weight: 620
+weight: 320
 ---
 
 # 1 分钟对接 OnWeChat

docSite/content/docs/use-cases/openai.md

@@ -4,7 +4,7 @@ description: "通过与 OpenAI 兼容的 API 对接第三方应用"
 icon: "model_training"
 draft: false
 toc: true
-weight: 620
+weight: 330
 ---
 
 ## 获取 API 秘钥

docSite/content/docs/use-cases/prompt.md

@@ -4,7 +4,7 @@ description: "FastGPT 提示词 & 限定词说明"
 icon: "sign_language"
 draft: false
 toc: true
-weight: 10
+weight: 310
 ---
 
 # AI 对话消息组成