Homepage layout and wide format SE module

• Reverts Ifcc55bbfbfcce676da3b57050f9f38a02849d8da to load correct

thumbnail image sizes and set card wrapper width to wider format

• Set a minimum width to the main group container on variant A
• Set a minimum width on the primary group
• Adjust the narrow width breakpoint upwards from 800 -> 1024px, so that

the sidebar looks more reasonable

Bug: T258005
Change-Id: If2ba00de04e6067cce1a27d6e62e22bd80a441fe