Front End/Mobile - Make sure item categories go two across on most mobile devices

[calexity]

Right now, the categories go one across on iPhone (and I assume on most Androids).

Would be great to have them go two across so more can fit on the screen.

This ticket is to:

• Make the categories go two across on smaller devices
  (Keep them as is on desktop/larger screens)

[shawnadelic]

Done