Remove preview images from the mobile view of the Initiatives page

[cindyli]

Is your feature request related to a problem? Please describe.

According to the design of how preview images are displayed on the Initiatives page, they are in vertical rectangular shape on the desktop view but in horizontal rectangular shape on the mobile view. This causes the scaling issue: vertical rectangular images look great on the desktop view but don't fit into the horizontal rectangle on the mobile view and vice versas.

Describe the solution you'd like

The solution is to remove preview images from the mobile view.