Mobile view

We can use SimpleList (or better, SimpleListConfigurable) with useMediaQuery to provide a more mobile-friendly view:
https://marmelab.com/react-admin/ListTutorial.html#responsive-lists
https://marmelab.com/react-admin/SimpleList.html#using-simplelist-on-small-screens

Maybe use the first 3 display elements from the list view to use as the lines of text?

2 Possible approaches here:

- We could create components based on the fields (as we do in the existing Datagrid).
- We could use the templating system to allow users to specify a string (e.g. `"%{views} views, %{user_count} users"`).
https://marmelab.com/react-admin/SimpleList.html#primarytext

Maybe best if we can support both options?

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A followup task may be to add a sort button to the view as well:
https://marmelab.com/react-admin/SortButton.html