docs(nuxt): use host '0' instead of env variable for dev server

[lucpotage]

The docs suggests the use of an env variable for the dev server which is not required. Setting host as '0' simplifies the setup.

Besides, I tested and it works well with Nuxt 3.17 and 4.0.

[netlify[bot]]

✅ Deploy Preview for tauri-v2 ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	aae7e7428a19b3eed914fa400a61dacd7cd7c0f6
🔍 Latest deploy log	https://app.netlify.com/projects/tauri-v2/deploys/686caf46b7da960008d0d00f
😎 Deploy Preview	https://deploy-preview-3351--tauri-v2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 96 (🔴 down 3 from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.