Migrate from React to Next.js

First goal: Migrate https://github.com/bahnzumberg/zuugle-suchseite/tree/uat from React to Next.js.

Second goal:

to improve the values in Google Pagespeed
to use the picture of each tour as Opengraph image (https://www.bahn-zum-berg.at/wp-content/uploads/2020/12/20201205_Zinnkopf_Gipfel1-783x522.jpg to tour https://www2.zuugle.at/tour/536/salzburg) dynamically using tour.image_url
returm dynamically for every detail tour (DetailReworked.js) one canonical url and the full list of alternate links - see code below.

DetailReworked.js

(!!tour && validTour && !!tour.canonical && tour.canonical.length > 0)  && tour.canonical.map((entry)=>{
    if (entry.canonical_yn === 'y'){
      return <link rel="canonical" href={`https://${entry.zuugle_url}`} hreflang={`${entry.href_lang}`}/>
    }else{
      return <link rel="alternate" href={`https://${entry.zuugle_url}`} hreflang={`${entry.href_lang}`}/>
    }

  })

bahnzumberg / zuugle-suchseite

Migrate from React to Next.js #471