feat: remove the ref parameter from url

This is used by (at least) Ghost (https://forum.ghost.org/t/ref-parameter-being-added-to-links/38335)

Examples:
- https://blog.exploits.club/exploits-club-weekly-newsletter-66-mitigations-galore-dirtycow-revisited-program-analysis-for-uafs-and-more/
- https://labs.watchtowr.com/is-the-sofistication-in-the-room-with-us-x-forwarded-for-and-ivanti-connect-secure-cve-2025-22457/

internal/reader/sanitizer/sanitizer.go

@@ -217,7 +217,8 @@ func sanitizeAttributes(baseURL, tagName string, attributes []html.Attribute) ([
 					continue
 				}
 
-				if cleanedURL, err := urlcleaner.RemoveTrackingParameters(value); err == nil {
+				// TODO use feedURL instead of baseURL twice.
+				if cleanedURL, err := urlcleaner.RemoveTrackingParameters(baseURL, baseURL, value); err == nil {
 					value = cleanedURL
 				}
 			}