Do not count banned users on homepage

[driesvints]

Banned users shouldn't be part of this count so let's filter them out. Maybe add a new scope on the User model which can be used a bit further up in the controller on the ->whereNull('banned_at') check as well.

https://github.com/laravelio/laravel.io/blob/main/app/Http/Controllers/HomeController.php#L27