remove event-specific info from the README
remove event-specific info from the README

plus added instructions for creating a qwiklabs account
GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst