Add disk and visibility configuration for avatars

[rpsimao]

Enhanced the avatar upload feature by allowing customization of the storage disk and visibility settings via configuration. Updated the README to reflect these new options and provide implementation guidance.

In the EditProfileForm.php added the 2 new directives in the FileUpload

 FileUpload::make('avatar_url')
    ->label(__('filament-edit-profile::default.avatar'))
    ->avatar()
    ->imageEditor()
    ->disk(config('filament-edit-profile.disk', 'public')) /*new disk directive*/
    ->visibility(config('filament-edit-profile.visibility', 'public')) /*new visibility directive*/
    ->directory(filament('filament-edit-profile')->getAvatarDirectory())
    ->rules(filament('filament-edit-profile')->getAvatarRules())
    ->hidden(! filament('filament-edit-profile')->getShouldShowAvatarForm()
),

in the config/filament-edit-profile.php

return [
    'disk' => 's3',
    'visibility' => 'public',
];

Updated the Readme.md to reflect this option