Check constraints for content elements and documents

[crydotsnake]

We should check the constraints on the content elements and the documents and adjust them if necessary. On the home page, for example, it makes no sense to create a blog post. This should only be allowed in the document for the blog.

[crydotsnake]

Wdyt? @Sebobo

[Sebobo]

Of course, I slowly started to add more constraints lately.

[crydotsnake]

Of course, I slowly started to add more constraints lately.

Awesome ! :)

Can you maybe create a draft PR? So i can help you there.