update API Key for Meilisearch in prod. in search package (#1).

This is a hard-coded change which addresses the bug (#1) which points to the
wrong URL for the Meilisearch server -- when running in prod. -- but this will
need further refactoring. I've already created an issue (#2) in the Issues
tracker in prep. of that work.

src/search.lisp

@@ -114,7 +114,7 @@ The API key is determined based on which environment this website is
 currently running in."
   (if (ritherdon-archive.config:developmentp)
       "Bearer meilisearch-beta-key"
-      "Bearer meilisearch-production-key-nera"))
+      "Bearer meilisearch-key"))
 
 (defun submit-entry (payload)
   "Adds a new article to the meilisearch database."