Removed placeholder headshots to get ready for production

layouts/partials/article-metadata.html

@@ -8,7 +8,7 @@
 <p><strong>Topics:</strong> {{ partial "topics.html" . }}</p>
 {{ if .Params.links }}
   <div class="mt-4">
-    <p><strong>Narrator Links:</strong></p>
+    <p><strong>Learn more:</strong></p>
     <ul class="list-disc pl-4 ml-4 mt-2">
       {{ range .Params.links }}
         <li class="mb-2">