fix(docs): fix support of Search Bar in docs

docs/.vitepress/config.ts

@@ -13,6 +13,10 @@ export default defineConfig({
       { text: "常见问题", link: "/faq/常见问题" },
     ],
 
+    search: {
+      provider: 'local'
+    },
+
     sidebar: [
       {
         text: "项目说明",

docs/.vitepress/theme/index.ts

@@ -13,11 +13,6 @@ import './style.css'
 
 export default {
   extends: Theme,
-  themeConfig: {
-    search: {
-      provider: 'local'
-    }
-  },
   Layout: () => {
     return h(Theme.Layout, null, {
       // https://vitepress.dev/guide/extending-default-theme#layout-slots