Canceling the "Build your first server role!" workshop

Regrettably, I need to cancel the "Build your first server role!" workshop. While preparing for it, we've identified a number of places that need significant rework in order to realistically be useful for out-of-tree roles. This rework won't be done before Flock and it doesn't make much sense to run this workshop with the old API since we know it's going to change.