Add navigation bar

[0xZeyad11]

Issue Description

In case of non-users

• It is just a simple navigation bar that should be has the following:

1. Sign up Button
2. Login Button

In case of users

• The navigation bar should has an avatar with the user profile picture that is clickable and works as a dropdown menu that has the following:

1. Profile settings -> navigates to the settings page.
2. logout