clean up the gitignore
clean up the gitignore

GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst