Fix: background grid display issue

[epoll31]

Description

I fixed BackgroundGrid to be more similar to the other backgrounds. I also removed the usingCn flag.

Proposed Changes

• updated BackgroundGrid card in the ui-group to me more similar to the other background cards
• updated BackgroundGrid in showcase to be more similar to the other backgrounds
• removed preview override and usingCn in BackgroundGrid docs page
• updated the link in credits.md to reflect the new url

Checklist

Please check the boxes that apply:

• [x] I have rebased my branch on top of the latest main branch.
• [x] I have tested the changes locally
• [x] I ran npm run build and build is successful
• [x] I have added necessary documentation (if applicable)
• [x] I have updated the credits.md file (if applicable)

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Name	Status	Preview	Comments	Updated (UTC)
syntax-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 6, 2024 4:45pm