docs: use new nuxi module add command in installation (#189)

Author: danielroe

docs/content/0.index.md

@@ -12,7 +12,7 @@ cta:
 secondary:
   - Star on GitHub →
   - https://github.com/nuxt-modules/google-fonts
-snippet: npm i -D @nuxtjs/google-fonts
+snippet: npx nuxi@latest module add google-fonts
 ---
 
 #title

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

@@ -5,23 +5,10 @@ Using Google Fonts in your Nuxt project
 ## Installation
 
 1. Install `@nuxtjs/google-fonts` dependency to your project:
-
-::code-group
-
-```bash [yarn]
-yarn add -D @nuxtjs/google-fonts
-```
-
-```bash [npm]
-npm install -D @nuxtjs/google-fonts
+```bash
+npx nuxi@latest module add google-fonts
 ```
 
-```sh [pnpm]
-pnpm i -D @nuxtjs/google-fonts
-```
-
-::
-
 2. Add it to your `modules` section in your `nuxt.config`:
 
 ::code-group