add CID

Author: kimsauce

cid-redirects.json

@@ -1587,6 +1587,7 @@
   "/cid/100000": "/docs/manage/deletion-requests",
   "/cid/100001": "/docs/search/get-started-with-search/build-search/search-templates",
   "/cid/100002": "/docs/search/copilot",
+  "/cid/100003": "/docs/search/copilot-multiturn-beta",
   "/cid/100004": "/docs/search/get-started-with-search/build-search/keyword-search-expressions",
   "/cid/100005": "/docs/get-started/sign-up",
   "/cid/100006": "/docs/get-started/library",