Fixed inclusion of the stdLayoutSource

pathbuilder.go

@@ -82,9 +82,11 @@ func (pb PathBuilder) GoFiles(dir, templateFile string) Option {
 
 					sm.Pages = append(sm.Pages, sitePage{
 						Path: relPath,
-						Source: mdTemplateSource{
+						Source: stdLayoutSource{
-							Template: tmpl,
+							MainSource: mdTemplateSource{
-							Data:     goFileDoc,
+								Template: tmpl,
+								Data:     goFileDoc,
+							},
 						},
 					})
 				}