Add training materials to the training page.
This is mostly @balameb 's material, I'm just pushing it out there so everyone knows where to find it!
\cc @gl-support
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is mostly @balameb 's material, I'm just pushing it out there so everyone knows where to find it!
\cc @gl-support