Add extra debug to link checking

docs/main.py

@@ -53,6 +53,8 @@ def check_link(url) -> bool:
         if url in cache:
             return True
 
+    print(f'Checking external URL: {url}')
+
     attempts = 5
 
     while attempts > 0:
@@ -66,6 +68,8 @@ def check_link(url) -> bool:
 
         attempts -= 1
 
+        print(f' - URL check failed with status code {response.status_code}')
+
     return False