Fix : Replace kebab function by slug for SEO optimization

[BeeKpr7]

Actually:

When we generate a “Table of Contents,” the links are generated using the kebab function based on the headings.

Summary:

This PR replaces the use of the kebab() function with the slug() function to enhance SEO optimization. The change ensures that generated slugs are more readable for search engine bots, leading to improved indexing and discoverability.

Reason for the Change:

•	The kebab() function only transforms strings into kebab-case, but it does not handle special characters, accents, or transliteration.
•	The slug() function is specifically designed for SEO purposes. It:
•	Converts accented characters (e.g., é) into their plain counterparts (e.g., e).
•	Removes special characters that are unsuitable for URLs.
•	Creates clean, URL-friendly slugs that improve search engine readability.

Benefits:

1.	Improved SEO: The slug() function produces slugs that are optimized for search engine crawlers.
2.	Better Readability: Generated slugs are more human-readable and suitable for URLs.
3.	Standardization: Aligns with Laravel’s best practices for slug generation.

Implementation Details:

•	Replaced all occurrences of kebab() with slug() in the relevant codebase.
•	Ensured backward compatibility where applicable by maintaining similar behavior with the improved functionality.

Testing:

•	Verified that all slugs are correctly generated in various scenarios (e.g., strings with special characters, multiple spaces, or accented characters).
•	Tested for edge cases to ensure no regressions.

Impact:

This change improves the overall quality of URL slugs, making them more compliant with SEO best practices and enhancing the user experience.