Complete the OAuth process by adding a redirect when pressing the login button with the provider. When the button is
pressed, the system will request the authentication URL from the backend, then the user will be redirected.
The reconstruction includes moving the Navbar component from shared to widget because Navbar is a group of elements, and
removing the login-signup form due to changes in logic that will use a popup flow to improve the user experience without
navigating to another page for authentication.
