UI: Crop Descriptors

Descriptor lists page (https://sandbox.genesys-pgr.org/descriptorlists, https://www.genesys-pgr.org/descriptorlists) is the entry page to descriptor publications by genebanks.

How can we re-design this entry page to descriptor lists to:

Include an explanation text of what "Descriptor lists" are.
Update the display of the elements in the list?
Allow for filtering by data provider, crop?

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