EPS-482: Navigation menu not redirecting correctly

[vijetaR]

Description

This pull request includes updates to fix the navigation menu anchor links and enhance the user experience when interacting with submenu items. The most important changes are as follows:

Bug Fixes:

• README.md: Updated the changelog to include a fix for anchor links correctly scrolling to sections/containers when submenu items with IDs are clicked.
• readme.txt: Added a similar changelog entry to reflect the fix for anchor links in the navigation menu.

Code Optimization:

• inc/js/frontend.js: Enhanced the _handleSinglePageMenu function to prevent the default action for anchor links and smoothly scroll to the target section if it exists.

Screenshots

Types of changes

Bug fix (non-breaking change which fixes an issue)

How has this been tested?

Checklist:

• My code is tested
• My code passes the PHPCS tests
• My code follows accessibility standards
• My code has proper inline documentation
• I've included any necessary tests
• I've included developer documentation
• I've added proper labels to this pull request