Add marble CMS to projects list

[taqh]

What does this PR do?

Adds Marble (usemarble/marble) to the list in data/projects.json

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• node scripts/validate-projects.mjs — confirms projects.json shape and no duplicate repoUrls.
• npm run build — per contributing guide.

Checklist

Required

• Filled out the "How to test" section in this PR
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits — N/A (JSON data only)
• Ran npm run build
• Checked for warnings, there are none
• Removed all console.logs — N/A (no code changes)
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues — N/A (no UI changes)

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR — N/A
• Updated the Docs if changes were necessary — N/A

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[kaf-lamed-beyt]

thank you for contributing, @taqh!