Review position of the filter button in the homepage

[allyoucanmap]

Description

@offtherailz highlighted that the position of the filter button makes unclear which catalog content will be filtered, see #10731 (review):

Featured are filtered too, but here graphically it looks that filter applies only on contents. I don't is a little unclear to me, but it's opinable.

An idea could be to re-introduce a global search input centered in the page positioned before all catalogs.
This search input could contain inline button so also the filter button.
We could also differentiate this search input from the text filter input in the filter form item by listing all matching resources with infinite scroll and on click open directly the resource (in this way it will be a sort of quick search).

Acceptance criteria

• Design and prototype a solution

Other useful information