Add : Added 'Dom Manipulation Methods' and 'Dom Traversal Methods' Video Link

[Darshan1904]

Description:

This pull request adds the video links for 'Dom Manipulation Methods — Web Dev Simplified' and 'Dom Traversal Methods — Web Dev Simplified' in the '13. DOM and Layout Trees' section of the README. The links provides a better explanation of the topics.

Link:

• 🎥 JavaScript DOM Manipulation Methods — Web Dev Simplified
• 🎥 JavaScript DOM Traversal Methods — Web Dev Simplified

Additional Context:
The videos delves into the various Methods for DOM Manipulation and Dom Traversal in JavaScript, which is crucial for understanding the topic.

Testing:
I've tested the link, and it's working as expected.

Reviewer Request:
@leonardomso

Description (Extended):

🧠 Concepts Covered in Videos:

        (DOM Manipulation)
        - Creating elements
        - Adding elements
        - Modifying data attributes
        - Removing elements
        
        (DOM Traversal)
        - How to traverse up the DOM
        - How to navigate down the DOM
        - All the methods for DOM traversal

Link to the videos:

• 🎥 JavaScript DOM Manipulation Methods — Web Dev Simplified
• 🎥 JavaScript DOM Traversal Methods — Web Dev Simplified

Could you please add the 'Hacktoberfest Accepted Label' to this , So I got eligible

[Darshan1904]

Hi @leonardomso,

I hope you're doing well. First of all, thank you for considering and merging my pull request.

I wanted to kindly request that you add the 'Hacktoberfest Accepted Label' to this merged pull request. It would help me qualify for Hacktoberfest, and I'd be grateful for your assistance with this.

Thank you once again for your support!