docs: use new nuxi module add command in installation

Author: danielroe

README.md

@@ -33,13 +33,13 @@ Find and replace all on all files (CMD+SHIFT+F):
 
 ```bash
 # Using pnpm
-pnpm add -D @ant-design-vue/nuxt
+npx nuxi@latest module add ant-design-vue
 
 # Using yarn
-yarn add --dev @ant-design-vue/nuxt
+npx nuxi@latest module add ant-design-vue
 
 # Using npm
-npm install --save-dev @ant-design-vue/nuxt
+npx nuxi@latest module add ant-design-vue
 ```
 
 2. Add `@ant-design-vue/nuxt` to the `modules` section of `nuxt.config.ts`