fix(cli): remove docsearch (#11415)

* fix(cli): remove docsearch

* chore: remove react

* docs: add changelog

packages/vant-cli/docs/config.md

@@ -16,7 +16,6 @@
     - [site.nav](#sitenav)
     - [site.versions](#siteversions)
     - [site.baiduAnalytics](#sitebaiduanalytics)
-    - [site.searchConfig](#sitesearchconfig)
     - [site.hideSimulator](#sitehidesimulator)
     - [site.simulator.url](#sitesimulatorurl)
     - [site.htmlMeta](#sitehtmlmeta)
@@ -355,13 +354,6 @@ module.exports = {
 };
 ```
 
-### site.searchConfig
-
-- Type: `object`
-- Default: `undefined`
-
-Documentation site search config. Based on [docsearch](https://docsearch.algolia.com/docs/behavior) of algolia.
-
 ### site.hideSimulator
 
 - Type: `boolean`