Logs a registered member in with an email and password.
The login() function returns a Promise that resolves when the member with
the specified email address and password is logged in.
The login() function only works with existing members. To register a new member use
the register() function.
Note:
wix-members-frontend are only partially functional when previewing your site.
View a published version of your site to see their complete functionality.
Login email address.
Member password.