ent/doc: ui changes for homepage

Reviewed By: alexsn

Differential Revision: D17074003

fbshipit-source-id: 7a0088f8eab37dab570eaace5fa836d70bb708ed

doc/website/static/js/custom.js

@@ -0,0 +1,7 @@
+/* eslint-disable */
+window.addEventListener('load', function() {
+    // add an id tag for images based on their alt attribute.
+    document.querySelectorAll('.container img').forEach(function(el) {
+        el.id = el.alt;
+    });
+});