docs: use new nuxi module add command in installation

Author: danielroe

Diff for: docs/content/1.get-started.md

@@ -9,18 +9,9 @@ main:
 # Getting Started
 
 1. Install dependency
-
-::code-group
-  ```bash [nuxi]
-  npx nuxi module add prismic
-  ```
-  ```bash [Yarn]
-  yarn add --dev @nuxtjs/prismic
-  ```
-  ```bash [npm]
-  npm install --save-dev @nuxtjs/prismic
-  ```
-::
+```bash
+npx nuxi@latest module add prismic
+```
 
 2. Update Nuxt config