smart build: define configuration variables

inc/config.php

@@ -1181,9 +1181,20 @@
 	// Website favicon.
 	// $config['url_favicon'] = '/favicon.gif';
 	
-	// EXPERIMENTAL: Try not to build pages when we shouldn't have to.
+	// Try not to build pages when we shouldn't have to.
 	$config['try_smarter'] = true;
 
+	// EXPERIMENTAL: Defer static HTML building to a moment, when a given file is actually accessed.
+	// Warning: This option won't run out of the box. You need to tell your webserver, that a file
+	// for serving 403 and 404 pages is /smart_build.php. Also, you need to turn off indexes.
+	$config['smart_build'] = false;
+
+	// Smart build related: when a file doesn't exist, where should we redirect?
+	$config['page_404'] = '/404.html';
+
+	// Smart build related: extra entrypoints.
+	$config['smart_build_entrypoints'] = array();
+
 /*
  * ====================
  *  Mod settings