refactor(web/panettone): Remove prevalence

Now that we've migrated over all the data to postgresql, we can get rid
of cl-prevalence as a dependency from Panettone along with all code that
mentions it.

Change-Id: I945f50a88fea5770aac5b4a058342b8269c0bea2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1495
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

web/panettone/src/packages.lisp

@@ -25,7 +25,6 @@
 
 (defpackage panettone
   (:use :cl :panettone.util :klatre :easy-routes :iterate)
-  (:import-from :cl-prevalence :get-id)
   (:import-from :defclass-std :defclass/std)
   (:import-from :alexandria :if-let :when-let)
   (:import-from