Update section behavior

render.go

@@ -52,6 +52,7 @@ type pageData struct {
 	IsRoot         bool
 	SectionIndex   int // -1 = whole page; >=0 = section being edited
 	InsertBefore   int // -1 = no insert; >=0 = splice new section at this index
+	Span           bool // causes section editing to also cover every sub-section to the next section of the same level
 	PostURL        string
 	RawContent     string
 	Content        template.HTML