fix(datasheet): markdown headings break the datasheet

close #23

markdown_utils.py

@@ -0,0 +1,17 @@
+import mistune
+from mistune.renderers.markdown import MarkdownRenderer
+
+
+class HeadingsRenderer(MarkdownRenderer):
+    def __init__(self, min_level: int):
+        super().__init__()
+        self.min_level = min_level
+
+    def heading(self, token, state):
+        token["attrs"]["level"] += self.min_level - 1
+        return super().heading(token, state)
+
+
+def limit_markdown_headings(source: str, min_level: int) -> str:
+    markdown = mistune.create_markdown(renderer=HeadingsRenderer(min_level))
+    return markdown(source)