updated codeblock in index

content/index.md

@@ -7,6 +7,21 @@ title: My First Post
 - This post has some content.
 
 ```python
-def foo():
-  return "bar"
+def md_to_html(
+    content: str,
+    resolve_links: bool = False,
+    source: Path | None = None,
+    layout: Layout | None = None,
+    item_map: dict[Path, Item] | None = None,
+) -> str:
+    if resolve_links and (source is None or layout is None or item_map is None):
+        raise TypeError(
+            "md_to_html() missing source and ctx when resolve_links is true"
+        )
+    parser = Parser()
+    ast = parser.parse(content)
+    renderer = ZonaRenderer(
+        resolve_links, source, layout=layout, item_map=item_map
+    )
+    return renderer.render(ast)
 ```