Remove Google Maps API key

Removed the API key that is provided in the Universal theme's
configuration file.

config/_default/hugo.toml

@@ -95,7 +95,7 @@ weight = 2
 
 # Google Maps widget: If `googleMapsApiKey` is not set, no key will be passed to Google (which likely results in a broken map widget).
 enableGoogleMaps = false
-#googleMapsApiKey = "AIzaSyAv7Sza8NSp9_l_g8G2vlo0H4ydEPn_2jY"
+#googleMapsApiKey = ""
 
 #latitude = "-12.043333"
 #longitude = "-77.028333"