fix(navigation): add your exams navigation

[usamabinnadeem-10]

Done

• Add 'Your Exams' navigation in header
• Add check for logged in user for navigation item

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• Click 'Your Exams' in navigation, it should take you to credentials/your-exams page
• 'Your Exams' navigation item should not be visible if user is logged out

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[webteam-app]

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