NAN days left in the challenge

[erhaneth]

Problem

On the progress page the number of challenge days shows "NAN", found this when testing https://challenge.8by8.us/signup

Goal

The amount of days left in the challenge should be a number.

Additional context

When user enter their email second time, they will see this issue.

[erhaneth]

In the progress.js file, you may encounter a situation where the currentUser variable and the contents of localStorage are both null.

Possible Reasons for Null Values
User Authentication: The user is not logged in, resulting in a null value for currentUser.

Data Retrieval: An issue in the code prevents the proper retrieval of the user's information, leading to a null value for currentUser.

Empty localStorage: No data has been saved to localStorage, resulting in a null value.

Code Execution Order: The code that sets currentUser and localStorage values has not run yet.