Merge branch 'master' of https://github.com/Microsoft/pxt-microbit

docs/device/serial.md

@@ -32,6 +32,8 @@ If you are using the Google Chrome browser, you can use our extension to get ser
 * Restart Chrome and open the [web editor](https://pxt.microbit.org)
 * The serial data will show below the simulator
 
+If the extension is enabled, it will not be possible to access the port/device for the micro:bit from other programs than Chrome.
+
 ### Windows
 
 You must install a device driver (for the computer to recognize the

docs/projects.md

@@ -10,8 +10,7 @@ Fun games to build with your @boardname@.
 [{
   "name": "Flashing Heart",
   "url":"/projects/flashing-heart",
-  "imageUrl": "/static/mb/projects/a1-display.png",
-  "cardType": "tutorial"
+  "imageUrl": "/static/mb/projects/a1-display.png"
 },{
   "name": "Smiley Buttons",
   "url":"/projects/smiley-buttons",