Cache Goodreads data and slow down bulk requests

tools/content/goodreads_series.py

@@ -143,9 +143,7 @@ def scrape_series(url: str) -> dict:
     if not identifier:
         raise ValueError(f"not a Goodreads series url: {url}")
     page = goodreads.download_page(url)
-    reason = goodreads.blocked_reason(page.text)
-    if reason:
-        raise ValueError(reason)
+    goodreads.raise_if_blocked(page)
 
     entries = entries_from_react_props(page.text) or entries_from_next_data(page.text) or entries_from_links(page.text)
     entries = unique_entries(entries)