Add in all Ember repos to be tracked

[acorncom]

Repos to track to start with (we can add to this once we've seen that it's actually useful :-)

• https://github.com/ember-learn/ember-help-wanted
• https://github.com/ember-learn/ember-help-wanted-webhook
• https://github.com/emberjs/guides
• https://github.com/emberjs/website
• https://github.com/emberjs/ember.js
• https://github.com/ember-cli/ember-cli

[acorncom]

And remove our testing repos as well