Set reusable global data on server side through stuff

https://kit.svelte.dev/docs#loading-input-stuff

src/routes/__layout.svelte

@@ -113,7 +113,8 @@
                     locations: data.location_aggregated[0].count.id,
                     countries: data.country_aggregated[0].count.id,
                 },
-            }
+            },
+            stuff: data,
         }
     }
 </script>