fix(datasheet): broken images, replace scanchain info with mux

- fix some of the broken images
- render the mux's info doc in place of the scanchain doc

markdown_utils.py

@@ -1,3 +1,4 @@
+import os
 import mistune
 from mistune.renderers.markdown import MarkdownRenderer
 
@@ -15,3 +16,20 @@ class HeadingsRenderer(MarkdownRenderer):
 def limit_markdown_headings(source: str, min_level: int) -> str:
     markdown = mistune.create_markdown(renderer=HeadingsRenderer(min_level))
     return markdown(source)
+
+
+class ImagePathRewriterRenderer(MarkdownRenderer):
+    def __init__(self, prefix: str):
+        super().__init__()
+        self.prefix = prefix
+
+    def image(self, token, state):
+        url = token["attrs"]["url"]
+        if not "://" in url and not url.startswith("/"):
+            token["attrs"]["url"] = os.path.join(self.prefix, url)
+        return super().image(token, state)
+
+
+def rewrite_image_paths(source: str, prefix: str) -> str:
+    markdown = mistune.create_markdown(renderer=ImagePathRewriterRenderer(prefix))
+    return markdown(source)