Fixes citations display style and custom error pages

hyrax/app/assets/stylesheets/hyrax/_rdms.scss

hyrax/app/controllers/application_controller.rb

hyrax/app/controllers/errors_controller.rb

hyrax/app/views/errors/error_message.html.erb

hyrax/app/views/hyrax/base/_citations_modal.html.erb

hyrax/app/views/hyrax/crc1280_experiments/_title.html.erb

hyrax/app/views/hyrax/datasets/show.html.erb

hyrax/config/application.rb

hyrax/config/routes.rb