JavaScript best practices

[Mwapsam]

Below are the issues noticed based on HTML, CSS, and JavaScript best practices

• Consider wrapping the parent div in a section and replacing the p tag with an h1 tag in the index, this will conform to the HTML semantics rules (every HTML page should have at least one h1 tag)
• Consider refactoring your code to ES6 classes because their syntax is way cleaner and easier to understand.
• It would be nice to refactor the loop in crud.js to use ForEach loop instead of the good old for loop
• Consider pushing all variable declarations to the beginning of the block