Add Ember playground in the console

[artemgurzhii]

When I'm reading docs, I'm usually running code in the console. And I have noticed that there is no way to directly run code in the console on official guides page.

Can something like this be added on each page(assuming URL is https://guides.emberjs.com/v2.14.0/object-model/reopening-classes-and-instances/) so users will have an option to play with it in the console.

<script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.14.0/ember.min.js" async></script>

[locks]

I'm not sure how useful that would be. What I suggest instead is that we could console.log some messages to the developer to try out https://ember-twiddle.com/.