In order to reduce complexity on xwiki.org instance and make it easier to manage the playground wiki itself (which used to be located on https://playground.xwiki.org) we decided to move it to its own dedicated instance on https://www.xwikiplayground.org.
The main difference for now is that you cannot use your xwiki.org account to edit on it anymore, you will need to register an account (which is going to be wiped every day like the rest of the wiki).
We might also decide to open up new features on playground that used to be impossible for security reason (Velocity script, etc.) when it was a subwiki of the xwiki.org instance. Still need to be discussed.
