Add option to filter unpublished resources from status grid

[hugopeek]

In some cases it's not relevant to see them, and thus they cause unnecessary clutter. Not in all cases though, for instance: when the site is live, you will probably keep your drafts unpublished.

So the best option is probably to add an indication somehow that a resource is unpublished, together with the ability to hide them from the grid with a toggle button.