Add Sveltia CMS and update Prose CMS

[ivanmarribas]

[netlify[bot]]

✅ Deploy Preview for jamstack-site ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	82d7999a80dc97bfe9adfc8f55a62e231917988d
🔍 Latest deploy log	https://app.netlify.com/sites/jamstack-site/deploys/656356d69474a60008570faf
😎 Deploy Preview	https://deploy-preview-941--jamstack-site.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

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