FAQ: Add Stadia Maps and remove MapQuest (Leaflet#9340)

Co-authored-by: Florian Bischof <design.falke@gmail.com>

FAQ.md

@@ -31,17 +31,17 @@ Popular commercial options, free up to a particular number of requests, include
 [MapBox](http://mapbox.com),
 [Bing Maps](http://www.microsoft.com/maps/choose-your-bing-maps-API.aspx) (using a [plugin](https://github.com/shramov/leaflet-plugins)),
 [Esri ArcGIS](http://www.esri.com/software/arcgis/arcgisonline/maps/maps-and-map-layers) ([official plugin](https://github.com/Esri/esri-leaflet)),
-[MapQuest](https://developer.mapquest.com/products) ([official plugins](https://developer.mapquest.com/documentation/leaflet-plugins))
-and [Here Maps](https://developer.here.com/).
+[Here Maps](https://developer.here.com/),
+and [Stadia Maps](https://docs.stadiamaps.com/tutorials/raster-maps-with-leaflet/).
 
 Always be sure to **read the terms of use** of a chosen tile provider, **know its limitations**, and **attribute it properly** in your app.
 
 #### I'm looking for satellite imagery to use with my Leaflet map, any options?
 
 [MapBox](http://mapbox.com),
 [Bing Maps](http://www.microsoft.com/maps/choose-your-bing-maps-API.aspx),
-[ArcGIS](http://www.esri.com/software/arcgis/arcgisonline/maps/maps-and-map-layers)
-and [MapQuest Open](http://developer.mapquest.com/web/products/open/map) provide satellite imagery among others.
+[ArcGIS](http://www.esri.com/software/arcgis/arcgisonline/maps/maps-and-map-layers),
+and [Stadia Maps](https://docs.stadiamaps.com/map-styles/alidade-satellite/) provide satellite imagery among others.
 
 #### I want to use Google Maps API tiles with Leaflet, can I do that?