added a hover style for nav link

[ibimina]

The Problem/Feature

Added hover style to navigation links ticket 95

Implementation details

On hover, the color of the links changes from white to yellow

Testing Steps

npm start Hover on nav link See changes

Checklist:

• [x] Pull Request title is good
• [x] Commit message is good (copy the Pull Request description to the commit message)
• [x] Tested code locally
• [x] Covered by automated tests
• [x] Approved by the author

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[ibimina]

@HridoyHazard Kindly review. Thanks