Implementing Accordion for overview plots
During the development of #1450 (closed) and #1605 (and #1487 (closed)), I felt there is a need for "packing" and thus a slightly different presentation of properties plots in the entries overview page.
For that, @wojasadr suggested to collapse plots in rows. @himanel1 then suggested to use Accordion.
I will implement this first for the ElectronicPropertiesCard. Then, we can use it for other cards and for including more and more properties into visualizations without cluttering the overview page with too many plots at once. This would allow to even show more quantities, rather than having to select just a few of them.