Create a render ast node type.

src/context/section.rs

@@ -27,8 +27,8 @@ impl RenderSection {
             for obj in section.children.iter() {
                 ret.push(RenderElement::new(
                     config,
-                    &output_directory,
-                    &output_file,
+                    output_directory,
+                    output_file,
                     obj,
                 )?);
             }