Revert "allow eggs to have a release date"

This reverts commit 6d13a257dd.

website/common/script/fns/datedMemoize.js

@@ -33,10 +33,6 @@ const memoize = fn => {
           identifier = config.identifier;
         }
       }
-
-      if (identifier.length === 0) {
-        identifier = args.filter(arg => typeof arg === 'string').join('-');
-      }
     }
     if (!checkedDate) {
       checkedDate = new Date();