fixed gofr guru badge design

[kursataktas]

Pull Request Template

Description:

• The style of the GOFR GURU badge was incorrect.

Checklist:

• [x] I have formatted my code using goimport and golangci-lint.
• [x] All new code is covered by unit tests.
• [x] This PR does not decrease the overall code coverage.
• [x] I have reviewed the code comments and documentation for clarity.

Thank you for your contribution!