docs: use v0 tag for install (#1370)

Author: snwkng

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

@@ -11,11 +11,11 @@ Add `@nuxt/image` devDependency to your project:
 
 ::code-group
   ```bash [yarn]
-  yarn add --dev @nuxt/image
+  yarn add --dev @nuxt/image@v0
   ```
 
   ```bash [npm]
-  npm install -D @nuxt/image
+  npm install -D @nuxt/image@v0
   ```
 ::