feat: Added more CSS styles & theme toggle to issue no. #10

[Bipasha1005]

Summary

This PR addresses Issue #10: "More css styles, light/dark mode toggle option, and improved README is required".

What’s new

• Added more CSS styles: Expanded the style options to include new color palettes/components.
• Implemented light/dark mode toggle: Users can now easily switch between light and dark themes.

How to test

1. Clone the repository and switch to this branch.
2. Run the app locally.
3. Try switching between light and dark modes using the toggle.
4. Check out the new styles on the UI components.

Sample Screenshots of home page

Before:

After:

and all the other pages updated too.

Checklist

• Added new CSS styles
• Implemented light/dark mode toggle
• Tested changes locally

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Please let me know if you have any feedback or suggestions!