fix: center contributor list on small screens

[crStiv]

Fixes #1205

What changed? Why?

• Added justify-center class to the contributors list container
• This change centers the avatar list on mobile devices, improving user experience on small screens
• The change is minimal and only affects CSS styles through Tailwind classes

Notes to reviewers

• The change only affects visual presentation, without changing any logic
• Only one CSS class added for centering through Tailwind
• Solution is simple and requires no additional dependencies

How has it been tested?

• Visually verified on mobile screen resolution
• Contributors list is now centered on all screen sizes
• Existing functionality (links, avatars) works as before

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