Final round of doc checking (#514)

* updated pxt version

* fixing casing issue in RPS image

* bumped pxt version

* fix casing

docs/courses/csintro/conditionals/activity.md

@@ -3,7 +3,7 @@
 For this activity, each student will need a micro:bit. 
 Everyone will create the same program, the classic rock paper scissor game.
 
-![Rock, paper, scissors](/static/courses/csintro/conditionals/rock-paper-scissors.png)
+![Rock, paper, scissors](/static/courses/csintro/conditionals/rock-paper-scissors-items.png)
 
 ## Introduce activity
 

package.json

@@ -38,6 +38,6 @@
     "semantic-ui-less": "^2.2.4"
   },
   "dependencies": {
-    "pxt-core": "0.12.121"
+    "pxt-core": "0.12.124"
   }
 }