Catalogs of entities

Provides views of latest publications, people, annotations, groups etc.

Note: existing views were refactored for more unified code, so the diffs are large in some cases, but insignificant (about, terms, privacy pages etc. due to removal of the unnecessary .simple class)
@mitar Can you check this migration (forward and backward) as I don't think I've got it right. In my dev environment it says the migration was executed

    Migrated 997 document(s) in 'Publications' collection (from 6.2.0 to 6.3.0): Adding a generator for number of annotations in a publication

But the annotationsCount fields weren't generated. Only when I manually added/removed an annotation, the annotation count updated correctly.