SEO / Google Optimization

[MoritzWeber0]

There are some tasks for optimizing google ranking & seo in general.
Split up in sub-issues

Originally reported by @therobrob

[therobrob]

Questions:

1. are our "country" and "operator" articles of type "blog" or "article"? should we use structures data for it?
2. structured data for NewsArticle provides "datePublished" AND "dateModified" – do we want to use that in md-Files?
3. structured data for NewsArticle uses images. For now, we have an image for each md-File in news-folder.
4. in news article we have the "author" attribute. Do we want to use it for structured data? For now, i use "FIP Guide" as an organization in google author-attribute.
   vgl. https://validator.schema.org/#url=https%3A%2F%2Fkarriere.bvg.de%2Fschueler%2Fausbildung

[therobrob]

1. type article
2. we wont show datePublished, only dateModified
3. one image for now :)
4. "FIP Guide" is ok