Fix user search suggestions z-index/overflow-hidden

[Gummibeer]

Right now the user-autocomplete on the homepage hero section is limited to 3 results as the required overflow-hidden on some wrapping elements cuts of the absolute positioned suggestions as well and/or make the container scroll.
The wanted result is that they are positioned and z-indexed "outside" the hero section and are just an overlay that can show 3, 5 or even 10 results without any other element scrolling and also not getting cut by any container.

Here's a screenshot of the current behavior - you can see that the results are cut-off and there's a scrollbar on the right.