Add absolutize_link util

utils/linkutils.py

@@ -23,3 +23,10 @@ def read_links(f: TextIO) -> List[Link]:
     reader = csv.reader(f)
     next(reader)  # Skip the header
     return [Link(link[1], link[2]) for link in reader]
+
+
+def absolutize_link(link: str, page_base: str) -> str:
+    """Ensure we have an absolute url."""
+    if link.startswith("./"):
+        link = page_base + link[2:]
+    return link