default theme for new blogs

docker/wp-config.php

@@ -168,6 +168,9 @@ define ('WPLANG', '');
 /* NoSpam API endpoint (internal). */
 define('NOSPAM_API_URL', 'http://nospam.investici.org:9001');
 
+/* default theme new blogs */
+define('WP_DEFAULT_THEME', 'classic');
+
 /*
  * Memcache servers for Wordpress object caching.
  */