Merge pull request #171 from arduino/marqdevx/portenta-X8/product-shop-url

Portenta X8: Add shop url

Author: BenjaminDannegard

content/hardware/04.pro/boards/portenta-x8/product.md

@@ -1,5 +1,6 @@
 ---
 title: Portenta X8
+url_shop: https://store.arduino.cc/portenta-x8
 url_guide: /software/ide-v1/tutorials/getting-started/cores/arduino-mbed_portenta
 core: arduino:mbed_portenta
 ---