feat: implement admin content management

[martinvibes]

Description

• Introduced a new Chat SVG icon for improved UI.
• Updated content management page to handle reported content and rejection logic.
• Enhanced dashboard layout and added new stats for reported content.
• Refactored components for better responsiveness and user experience.

• Added BookTable, BookDetails, StatsGrid, TimeFilter, RejectModal, and ReportsSection components for better content management.
• Refactored the main content management page to utilize new components, improving readability and maintainability.
• Updated the layout and styling to align with design specifications.

Closes #61

[martinvibes]

@Iwueseiter kindly review :)

[Iwueseiter]

Great work @martinvibes.
Thank you for contributing.