Mobile, the "our teams" card looks squeezed

[huayunh]

Describe the bug / expected behavior

On mobile, the team member bio cards should be only one column instead of two

What are the steps to reproduce?

1. Go to https://brightlayer-ui-dev.github.io/community/our-team
2. Shrink the browser width as much as you can
3. Observe that everything is tight

Screenshots / Screen recording

Suggested fix

blui-doc-it/src/app/components/contributors/MaintainersCards.tsx

Line 52 in 61e6074

columns: { xs: 2 },

This line needs to be conditioned so that the 2 column style applies to only sm and above