Copy docs into Zeek repo directly

This is based on commit 2731def9159247e6da8a3191783c89683363689c from the
zeek-docs repo.

doc/scripting/js/intel-insert.js

@@ -0,0 +1,10 @@
+// intel-insert.js
+zeek.on('zeek_init', () => {
+  let intel_item = {
+    indicator: '192.168.0.1',
+    indicator_type: 'Intel::ADDR',
+    meta: { source: 'some intel source' },
+  };
+
+  zeek.invoke('Intel::insert', [intel_item]);
+});