Actually hide gps-track, add better documentation output

assets/layers/gps_location_history/gps_location_history.json

@@ -7,6 +7,5 @@
     "#": "Cache is disabled here as these points are kept seperately",
     "maxCacheAge": 0
   },
-  "mapRendering": null,
-  "shownByDefault": false
+  "mapRendering": null
 }

assets/layers/gps_track/gps_track.json

@@ -9,6 +9,7 @@
   "title": {
     "render": "Your travelled path"
   },
+  "shownByDefault": false,
   "tagRenderings": [
     {
       "id": "Privacy notice",