docs: 更新 favicon 链接并添加 basePath 配置

- 修改 favicon 链接从 "../images/favicon.ico" 到 "images/favicon.ico"
- 在 docsify 配置中添加 basePath: '/ragflow-plus/'

docs/index.html

@@ -5,7 +5,7 @@
   <meta charset="UTF-8">
   <title>Ragflow-Plus</title>
   <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
-  <link rel="icon" href="../images/favicon.ico" type="image/x-icon">
+  <link rel="icon" href="images/favicon.ico" type="image/x-icon">
   <meta name="description" content="Description">
   <meta name="viewport"
         content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
@@ -21,6 +21,7 @@
       name: 'Ragflow-Plus',
       repo: 'https://github.com/zstar1003/ragflow-plus',
       loadSidebar: '_sidebar.md', 
+      basePath: '/ragflow-plus/',
       auto2top: true,
       subMaxLevel: 2,
       pagination: {