Add smooth scrolling effect to navigation links

[992manav]

Closes: #1793

This update adds a smooth scrolling effect to the navigation links. When users click on the navigation links, the page smoothly scrolls to the target section instead of jumping directly. This enhancement improves user experience by making navigation more fluid and visually pleasing.

https://github.com/user-attachments/assets/d05273b4-33b8-451f-ab45-4b20316ee4e1

• My code adheres to the established style guidelines of the project.
• I have included comments in areas that may be difficult to understand.
• My changes have not introduced any new warnings.
• I have conducted a self-review of my code.