Add preconnect link for matomo

Author: cdrini

openlibrary/templates/site/head.html

@@ -19,6 +19,7 @@
 
     <link rel="canonical" href="$request.canonical_url" />
     <link rel="preconnect" href="https://athena.archive.org">
+    <link rel="preconnect" href="https://apollo.archive.org">
 
     <link rel="search" type="application/opensearchdescription+xml" title="Open Library" href="/static/opensearch.xml">
     <link rel="manifest" href="/static/manifest.json">