properly format content pages in how-to-earn-miles

[ramboz]

List pages where we need to fix the content structure:

• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/additional-partners
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/airline-partners
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/car-partners
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/convert-partner-points
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/earn-with-delta
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/exception-fares
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/hotels-airbnb
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/overview
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/skymiles-offers
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/skymiles-partners-offers
• [x] https://www.delta.com/us/en/skymiles/how-to-earn-miles/vacations-and-cruises

[askayastha22]

This issue can be closed once @Dereje24 completes #106 and reorganizes the page content of skymiles-partner-offers.

[ramboz]

Blocked by #106