Only print the contexts.

This allows us to pipe the output to jq to see the context easier. We can see the rendered output in the files written to disk.

src/context/section.rs

@@ -18,6 +18,6 @@ impl RenderSection {
         output_file: F,
         section: &Section,
     ) -> Result<RenderSection, CustomError> {
-        todo!()
+        Ok(RenderSection {})
     }
 }