properly format content pages in airline-credit-cards

[ramboz]

List pages where we need to fix the content structure:

• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/2021-status-boost
• [ ] https://www.delta.com/us/en/skymiles/airline-credit-cards/amazon-offer
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/american-express-business-cards
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/american-express-personal-cards
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/business-card-comparison
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/card-comparison
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/international-credit-cards
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/overview
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/pay-with-miles
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/pay-with-miles-international
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/plan-it-by-american-express
• [x] https://www.delta.com/us/en/skymiles/airline-credit-cards/takeoff-15