restrict access to Admin page
currently the Admin page is open to anyone who stumbles upon it. The URL is highly guessable so non-authorized folks might easily find it.
The only function is to clear the Memcache which isn't destructive. Clearing the cache causes subsequent requests to fetch data from the Alma SRU API which is a little slower.
One other effect of clearing the cache is to re-set the Cylinder of the Day causing a new one to be randomly selected from the list.