Copy docs into Zeek repo directly

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

doc/scripting/js/global-vars.js

@@ -0,0 +1,9 @@
+// global-vars.js
+const timeouts = zeek.global_vars['Conn::analyzer_inactivity_timeouts'];
+
+// Similar to redef.
+timeouts['AllAnalyzers::ANALYZER_ANALYZER_SSH'] = 42.0;
+
+zeek.on('zeek_init', () => {
+  console.log('js', timeouts);
+});