Beautify the Bottom Bar and Rename "Sports" to "Events", Add 'Bookmarks' category as well

[ShubhKanodia]

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issue: Beautify the Bottom Bar and Rename "Sports" to "Events", add item 'bookmark' as 4th child
description: The current bottom navigation bar in the PES Buzz app serves as an essential element for user navigation. However, there is room for improvement. This issue involves enhancing the appearance of the bottom bar and changing the label "Sports" to "Events" for a more polished user interface.

Tasks:

• Update the icons for the bottom navigation items to make them more visually appealing.
• Refine the labels for the bottom navigation items, changing "Sports" to "Events" for improved clarity.
• Add another item "bookmarks" that displays bookmarks for a specific user.

Acceptance criteria:

• The bottom navigation bar has a visually appealing design that enhances the overall UI.
• The "Sports" label is changed to "Events" for improved user understanding.

Definition of done:

• The updated bottom bar code is clean, well-documented, and follows Flutter best practices.
• The updated bottom bar is tested and functions correctly.
• The issue is reviewed and accepted for implementation.

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This issue aims to improve the user experience and visual design of the PES Buzz app by beautifying the bottom navigation bar and ensuring that the navigation label accurately reflects its purpose.