docs: 更新 docsify 配置

- 修改 loadSidebar 路径从 '_sidebar.md' 到 'docs/_sidebar.md'
- 移除了 basePath 配置项

docs/index.html

@@ -20,8 +20,7 @@
     window.$docsify = {
       name: 'Ragflow-Plus',
       repo: 'https://github.com/zstar1003/ragflow-plus',
-      loadSidebar: '_sidebar.md', 
+      loadSidebar: 'docs/_sidebar.md', 
-      basePath: '/ragflow-plus/',
       auto2top: true,
       subMaxLevel: 2,
       pagination: {