docs: use new nuxi module add command in installation (#53)

docs/content/1.docs/1.getting-started/1.setup.md

@@ -5,22 +5,9 @@ A Nuxt module for simplifying the use of Mongoose in your project.
 ## Installation
 
 1. Install `nuxt-mongoose` to your dependencies.
-
-::code-group
-
-  ```bash [pnpm]
-  pnpm add nuxt-mongoose -D
-  ```
-
-  ```bash [npm]
-  npm install nuxt-mongoose -D
-  ```
-
-  ```bash [yarn]
-  yarn add nuxt-mongoose -D
-  ```
-
-::
+```bash
+npx nuxi@latest module add nuxt-mongoose
+```
 
 2. Add `nuxt-mongoose` to the `modules` section of your `nuxt.config` file.