feat(data): add Overpass Turbo to Geolocation Tools / Maps (THE-77)

Adds overpass-turbo.eu as a geolocation resource. This is a clean
cherry-pick of the valid data change from PR#535 — the CSS changes
from that PR were dropped as obsolete (superseded by THE-32/THE-72).
The duplicate Twitter > Location / Mapping entry was also excluded
per board direction.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

public/arf.json

@@ -3732,6 +3732,11 @@
           "type": "url",
           "url": "https://www.openstreetmap.org/"
         },
+        {
+          "name": "Overpass Turbo",
+          "type": "url",
+          "url": "https://overpass-turbo.eu/"
+        },
         {
           "name": "EarthExplorer",
           "type": "url",