implement accordions block

[ramboz]

We can ignore the search field in this issue. This will be handled separately

Some reference pages:

• https://www.delta.com/us/en/skymiles/how-to-earn-miles/airline-partners
• https://www.delta.com/us/en/skymiles/how-to-earn-miles/convert-partner-points
• https://www.delta.com/us/en/skymiles/how-to-earn-miles/skymiles-partners-offers