Update shared assets (#601)

Author: microbit-robert

index.html

@@ -29,8 +29,8 @@
     <link rel="stylesheet" href="/css/global.css" />
     <link rel="stylesheet" href="/css/all.min.css" />
 
-    <script src="https://shared-assets.microbit.org/common/v1/common.js" async></script>
-    <link rel="stylesheet" href="https://shared-assets.microbit.org/common/v1/main.css" />
+    <script src="https://shared-assets.microbit.org/common/v2/common.js" async></script>
+    <link rel="stylesheet" href="https://shared-assets.microbit.org/common/v2/main.css" />
     <script>
       // GA config itself is via the common assets config depending on consent.
       window.dataLayer = window.dataLayer || [];