BookStack\Repos\UserRepo::isOnlyAdmin PHP Method

    public function isOnlyAdmin(User $user)
    {
        if (!$user->roles->pluck('name')->contains('admin')) {
            return false;
        }
        $adminRole = $this->role->getRole('admin');
        if ($adminRole->users->count() > 1) {
            return false;
        }
        return true;
    }