To avoid a conflict with minWidth (min-width CSS property) in styled-system.

Looks like it's also generating CSS for min-width:

  box-sizing: border-box;
  min-width: small;
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(32rem,1fr));
  grid-gap: 2px;

minColumnWidth looks like a good alternative. Also more clear what it does.

• Rename minWidth to minColumnWidth
• Update docs