feat(main.py): Normalize external links for sitemap

To ensure consistency within our sitemap, we've introduced logic that normalizes external channel links to relative paths. This change detects links starting with "https://" and transforms them into relative paths by stripping the protocol and domain parts. This adjustment facilitates better integration with the site's navigation structure, eliminating potential issues with external link handling and improving the user experience when accessing these channels through the sitemap.

src/structables/main.py

@@ -492,6 +492,10 @@ def route_sitemap(path=""):
         for li in main.select("ul.sitemap-listing li"):
             channel = li.a.text
             channel_link = li.a["href"]
+            
+            if channel_link.startswith("https://"):
+                channel_link = f'/{"/".join(channel_link.split("/")[3:])}'
+
             channels.append([channel, channel_link])
         groups.append(["", "", channels])