Add Explore Books feature to navbar

[Ctoic]

Related to #141

Add "Explore Books" feature to the navbar and implement book cards with hover flip animation.

• Navbar Addition:

  • Add "Explore Books" option to the navbar in about.html and adventures.html.
  • Ensure proper routing to explore-books.html.

• Script Changes:

  • Add event listener for "Explore Books" option in the navbar in script.js.
  • Ensure proper routing to explore-books.html.

• Book Data:

  • Add sample book data for "Explore Books" feature in data/books.json.

• Explore Books Page:

  • Create a new page explore-books.html to display book cards.
  • Implement hover flip animation for book cards.

• Styles:

  • Add styles for book cards and hover flip animation in style.css.

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