GUI: Show a list of pinned stuff fetched from all registered Pups

GUI: 

- [ ] Show a list of pinned stuff fetched from all registered Pups 
- [x] (OPTIONAL) ideally, with tiny previews (only for images)

—> table with columns: 
- img_preview(optional!); 
- filename(if possible?);
- hash;
- `[ ]` pinata;
- `[ ]` other_svc;
- `[ ]` rasp_pi;
- `[ ]` ... 