am 22cc2764: implement new organization for Training classes This also moves a few...

am 22cc2764: implement new organization for Training classes This also moves a few of the documents from API Guides > Best Practices into the new courses for best practices. This is also dependent on CL Ieac8a97a8d6fda41a3682241901150cfe16afc4d which generates the lis

* commit '22cc2764cc74e52888b043e0c6371594305bb5e9':
  implement new organization for Training classes This also moves a few of the documents from API Guides > Best Practices into the new courses for best practices. This is also dependent on CL Ieac8a97a8d6fda41a3682241901150cfe16afc4d which generates the list of classes/lessons on each course landing page.