Add sentry integration

[tobiasdiez]

... for better error monitoring (especially for PRs with failing deployment on azure)

• Nuxt module: https://sentry.nuxtjs.org/
• Not yet available for nuxt 3: Plan for Nuxt 3 version nuxt-community/sentry-module#530 -- replaced by https://www.npmjs.com/package/@sentry/nuxt ?