Add customizable enterprise build

frontend/src/index.mempool.html

@@ -5,6 +5,7 @@
   <meta charset="utf-8">
   <title>mempool - Bitcoin Explorer</title>
   <script src="/resources/config.js"></script>
+  <script src="/resources/customize.js"></script>
   <base href="/">
 
   <meta name="description" content="Explore the full Bitcoin ecosystem with The Mempool Open Source Project®. See the real-time status of your transactions, get network info, and more." />