[TASK] Provide a default for the important lib.mainContent typoscript

Configuration/TypoScript/Frontend/setup.txt

@@ -26,6 +26,9 @@ page.headerData {
 	}
 }
 
+# content rendering information for the single news view
+lib.mainContent < styles.content.col1
+
 plugin.tx_sgnews {
 	view {
 		templateRootPath = {$plugin.tx_sgnews.view.templateRootPath}