[Refactor] Refactor the register page with the following fields, etc.

[gbowne1]

Resgiter will have these fields:

First Name: This field captures the user's first name.

Last Name: This field captures the user's last name.

Email Address: This field captures the user's email address, which is often used as a unique identifier for the account. This will not be required for login.

Password: This field captures the user's chosen password for account authentication. This should also have an eye icon to toggle password visibility.

Confirm Password: This field asks the user to re-enter the password to ensure accuracy.

Username: This field captures the user's desired username, which may be used for account identification.

Fix the CSS declaration error 'Error in parsing value for ‘columns’. Declaration dropped.'