[site-reviews] Only use initials avatars and change colour

/**
 * Change the initials avatar colours to gray with white text
 * @return array
 */
add_filter('site-reviews/avatar/colors', function () {
    return [
        ['background' => '#aaa', 'color' => '#fff'],
    ];
});

/**
 * Only display initials avatars; make sure to disable the "Regenerate Avatars" setting.
 * @param array $attributes
 * @param \GeminiLabs\SiteReviews\Review $review
 * @return array
 */
add_filter('site-reviews/avatar/attributes', function ($attributes, $review) {
    if ('initials' === glsr_get_option('reviews.avatars_fallback')) {
        $attributes['src'] = glsr('Modules\Avatar')->generateInitials($review);
    }
    return $attributes;
}, 10, 2);