fix: Broken link, wrong image for graphql course

[vyktoremario]

Type of change

• Content addition
• Bug fix
• Behavior change

Summary of change

With respect to the GraphQL DataLoader JS marathon course:

• The logo should be This Dot and not Star's profile image

• Clicking on the card does not go to YouTube

Checklist

• This fix resolves Add data loaders JS Marathon to courses #700
• The changes follow the contributing guidelines
• I have verified the fix works and introduces no further errors

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[thisdot-bot]

Hi @vyktoremario. 👋

Your PR has been approved and merged. 🎉

Thank you for your continued contributions to framework.dev. ❤️

Keep up the great work!