add gfm to markdown parser

src/zona/markdown.py

@@ -4,6 +4,9 @@ from pathlib import Path
 from marko.inline import Link, Image
 from marko.block import FencedCode
 from marko.html_renderer import HTMLRenderer
+from marko.ext.gfm import elements as gfme
+from marko.ext.gfm.renderer import GFMRendererMixin
+from marko.helpers import MarkoExtension
 from marko.parser import Parser
 from zona.config import ZonaConfig
 from zona.layout import Layout
@@ -19,7 +22,7 @@ from zona.log import get_logger
 logger = get_logger()
 
 
-class ZonaRenderer(HTMLRenderer):
+class ZonaRenderer(GFMRendererMixin, HTMLRenderer):
     def __init__(
         self,
         config: ZonaConfig | None,
@@ -131,7 +134,17 @@ def md_to_html(
         raise TypeError(
             "md_to_html() missing source and ctx when resolve_links is true"
         )
+
     parser = Parser()
+    for element in (
+        gfme.Paragraph,
+        gfme.Strikethrough,
+        gfme.Url,
+        gfme.Table,
+        gfme.TableRow,
+        gfme.TableCell,
+    ):
+        parser.add_element(element)
     ast = parser.parse(content)
     renderer = ZonaRenderer(
         config,