Re-enable user agreement

hyrax/app/controllers/agreements_controller.rb

hyrax/app/controllers/application_controller.rb

hyrax/app/controllers/users_controller.rb

hyrax/app/views/agreements/deposite_agreement.html.erb

hyrax/app/views/layouts/homepage.html.erb

hyrax/app/views/layouts/hyrax/dashboard.html.erb

hyrax/config/routes.rb

hyrax/db/schema.rb

hyrax/spec/features/deposite_agreement_spec.rb

hyrax/spec/support/capybara.rb