doc: make header smaller and dropdown click-driven when JS is on
This PR finishes the work started on https://github.com/nodejs/node/pull/41404 by making the header small and the menu click-driver when JS is available on the browser.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This PR finishes the work started on https://github.com/nodejs/node/pull/41404 by making the header small and the menu click-driver when JS is available on the browser.