Update table of content in readme file (Why JavaScript & ES6 and More…

[alirafatartist]

Hi @didicodes This pull request addresses an issue by refining the structure of the Readme file. Specifically, I've updated the Table of Contents to enhance readability and provide clarity on the sections related to "Why JavaScript & ES6 and More & Promise," and "Fun Projects and Closures." This modification ensures a better navigation experience for users, making it easier to locate relevant information within the document. The changes aim to improve the overall organization of the Readme, facilitating a more user-friendly and accessible documentation for anyone interacting with the project.