Added hover feature

[KartikG2]

Added hover feature to all the feature courses section in dark mode. previously only one card was having the hover effect,
Now i have added to all the cards in the feature courses section.

issue : #760

plz merge the pr

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[PriyaGhosal]

@KartikG2
Your pull request has been successfully merged! Don't stop here—continue contributing by addressing more issues and aiming to become a top contributor. You can also contribute in my another Repository BuddyTrail which is also under Hacktoberfest
Great contribution to HACKTOBERFEST'24! 🎉