Updates Part 1

[momo-87]

Added Features:

• Use OnInput instead of onChange to target any change in the input field
• Create a different component for the search box instead of having it integrated into the NavBar component
• Update the README.md file
• Add style for 220px media screen size
• Add style for different devices screen sizes
• Add a return button to the details page
• Add footer
• Refactor the code and delete SelectedCity.jsx component