feat(hikes): hide on-map attribution control, add swisstopo credit

Drop Leaflet's bottom-right attribution control on both the overview and
detail maps for a cleaner frame. The swisstopo tile licence still requires
their credit, so keep it on the page: the detail page already shows it in
the meta footer, and the overview now gets a tiny "Kartendaten © swisstopo"
line at the bottom of the listing.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.79.0",
+	"version": "1.79.1",
 	"private": true,
 	"type": "module",
 	"scripts": {