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Die Content ID: 01-region.md beinhaltet den Ordnernamen(Bandnummer) des Anhangordners (static/img/[bandnummer])

Wenn dies nicht gegeben ist, liefert die API fehlerhaft aus (404).
Fehlermeldung muss gutes Reporting beinhalten

ReadPage handlers assets functions creates error if static folder != hugoId
Example: 09-limbacher-land.md => static/img/9

Plus: page.Bilder.assetsPath darf bei contentType = "regionen" keinen contentType und hugoID beinhalten
`
switch contentType {
case "themen":
assetsFilePath = strings.Join([]string{assetsDir, "img", regionNr, contentType, hugoID}, "/")
case "exkursionen":
assetsFilePath = strings.Join([]string{assetsDir, "img", regionNr, contentType, hugoID}, "/")
case "regionen":
regionNr := strings.Split(fileName, "-")[0]
assetsFilePath = strings.Join([]string{assetsDir, "img", regionNr}, "/")
default:
assetsFilePath = ""
}

if assetsFilePath != "" {
    assets, err = h.Dir.Read(assetsFilePath)
    if err != nil {
        errDirNotFound.Write(w)
        return
    }

    page.Bilder = make([]string, len(assets))
    apiAssetsPath := strings.Join([]string{"http://", r.Host, "/assets"}, "")
    assetsPath := strings.Join([]string{apiAssetsPath, "img", regionNr, contentType, hugoID}, "/")
    // write assetsDir content to page.Bilder slice
    for i, item := range assets {
        assetsUrl := strings.Join([]string{assetsPath, item.Name}, "/")
        page.Bilder[i] = assetsUrl
    }`