Update feature icons

Author: sebromero

content/hardware/04.pro/shields/portenta-cat-m1-nb-iot-gnss-shield/features.md

@@ -5,19 +5,19 @@ The Portenta CAT.M1/NBIOT GNSS SHIELD brings cellular communication and localiza
 </FeatureDescription>
 
 <FeatureList>
-<Feature title="Low power global community" image="configurability">
+<Feature title="Low power global community" image="world-map">
 
 NB-IoT and Cat-M1 are both 3GPP standardized technologies built on next generation network architecture for low power IoT connectivity. 
 
 </Feature>
 
-<Feature title="Portenta Form Factor" image="mcu">
+<Feature title="Portenta Form Factor" image="mkr-form-factor">
 
 The Portenta Cat.M1/NB IoT GNSS Shield has been specifically designed to provide reliable connectivity to the Portenta family of boards for a wide range of telemetry applications. 
 
 </Feature>
 
-<Feature title="3GPP" image="wifi-bluetooth">
+<Feature title="3GPP" image="hw-pin">
 
 Gain direct access to the TX62 hardware using the various pads provided on the shield.