release_3309

All PRs to be released

#2658 Remove redundant regression test artefacts for calculate-state-pension
#2653 Denmark marriage tool update - Content change request
#2648 Add "Deploy to Heroku" button to README
#2643 Quick improvements to views: Remove unused partials and improve folder structure
#2647 Fix label's for and input's id of money question mismatching
#2604 Marriage abroad opposite sex italy
#2644 Improve documentation about creating a new Smart Answer
#2580 Correcting consular fees links for Kazakhstan and Kyrgyzstan
#2640 Remove next_node_calculation block functionality
#2638 Convert next_node_calculation blocks into on_response blocks in benefit-cap-calculator
#2637 Refactor maternity-paternity-calculator to remove use of next_node_calculation blocks
#2639 Document use of the "Passed factcheck" label

PRs to be checked

#2653 Denmark marriage tool update - Content change request
#2648 Add "Deploy to Heroku" button to README
#2643 Quick improvements to views: Remove unused partials and improve folder structure
#2647 Fix label's for and input's id of money question mismatching
#2604 Marriage abroad opposite sex Italy
#2580 Correcting consular fees links for Kazakhstan and Kyrgyzstan