removing deprecated _constituent-stories collection
removing unnecessary assets
updating gitignore file
make constituent stories specified in zip-data.csv - closes #126
update to csv_to_page to consolidate code significantly
updating constituent stories to have one story use image from S3 assets bucket and have the rest blank
do not show constituent story if not present. same for image associated with story - #125
styling for conditionally showing constituent story - #125
updating zip-data.csv to have one zip with a constituent story defined and all else with none defined