Copy docs into Zeek repo directly

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

doc/scripting/js/hello.js

@@ -0,0 +1,5 @@
+// hello.js
+zeek.on('zeek_init', () => {
+  let version = zeek.invoke('zeek_version');
+  console.log(`Hello, Zeek ${version}!`);
+});