refactored scraping of cases

& fixed scraping of cases where data is merged in one h2-element
I purposely did not touch the journal articles and the original authors'
decision which information to scrape.
Of course, I could rewrite that part as well (and include DOI), but I
would save that for later.

You are right, though, that "pages" should not save the paragraphs.
Those should be entered into the locator by the person actually citing
an article in JurPC. As I said, let's keep that in mind for later.