Revert "Rotate in 4 GMS journals into recently integrated"

This reverts commit 0ded6e8e35fdc46b53703f556cf4d7e962f7d541.

Email from peggy:
> I don't think we should highlight or display any of the recently integrated GMS journals' logos on the homepage. These are minor journals with little international visibility and no content in Dryad--yet.  It is only important that their logos will display appropriately on the data landing page when we do get data from these journals.  Is that in place?
>
> I think I'd prefer to see the homepage highlight better known journals -- I can't remember what was there before. Perhaps
> Ecology Letters
> Palaeontology
> Elementa
> Ecology and Evolution