added material endpoints for rest of post types

plugins/cia-endpoints/includes/formats.php

     $filtered[hero] = get_post_meta( $item->ID, 'hero_header', true );
 
     // Materials + type endpoints
-    $posts_with_type = ['artist', 'exhibition', 'event'];
+    $posts_with_type = ['artist', 'exhibition', 'event', 'short', 'guide', 'object', 'publication', 'technique' ];
     if( in_array($item->post_type, $posts_with_type) ) {
         $filtered[materials] = make_taxonomy_endpoint_for(get_the_terms( $item, 'material'));
         $filtered[subtypes] = make_taxonomy_endpoint_for(get_the_terms( $item, $item->post_type . '_type' ));