Merge branch 'main' of https://github.com/GoranKukic/javascript-fundamentals

Intro description of main file changed

Readme description updated

Added new content about asynchronous functions and async-await to main file

Added new lesson anbout asynchronous functions and async-await

Aded file with all sections and table of contents with links for easy access to each lesson, and links to original source at end of each lesson

Changed name of Introduction to events section

Added new Document Object Model section

Added new updated clientside web APIs section

Added introduction to events section

Added new updated clientside web APIs section

Added clientside web APIs section

Added Closures section

Added equality comparisons and sameness section

Added enumerability and ownership of properties section