fix: allow http protocol in Next.js image remote patterns

External journal article thumbnails served over plain HTTP (e.g.
ars.els-cdn.com) were rejected by the _next/image optimizer because
remotePatterns only included https. Added an http pattern entry.

Author: thostetler

next.config.mjs

@@ -163,6 +163,10 @@ const nextConfig = {
         protocol: 'https',
         hostname: '**',
       },
+      {
+        protocol: 'http',
+        hostname: '**',
+      },
     ],
   },
   compiler: {