code: func (service *Service) ShowPublicSite(w http.ResponseWriter, request *http.Request) {
  	htmlData, err := html.Asset(mainpageFileName)
  	if err != nil {
  		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
  		return
  	}
  	w.Write(htmlData)
  }
docs: //ShowPublicSite shows the public website