Try: Update instagram grid pattern to use the group (option 2)

[juanfra]

Description

Potential fix to #468

I'm updating the Instagram grid to have a group block in the first square, using the section styles and having vertical padding so that it doesn't look too short on mobile.

Screenshots

Screen.Recording.2024-10-10.at.16.39.42.mov

Testing Instructions

1. Create a page.
2. Add the pattern.
3. Test the page in different style variations, confirm that the colors are accessible and look good.
4. View the page in different viewports, confirm that it looks good.

[github-actions]

Preview changes

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[github-actions]

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[juanfra]

Closing as it was reviewed here and we're going with option 1.