Feature request: Give new users a clue

The first time you use CyberChef you have no idea how to make it work. It's very unintuitive that you have to drag/drop an Operation from the left Operations pane to the center Recipe pane. The About/Support option doesn't seem to help either.

It would be helpful to have some visual clue.

Start by reproducing the first-use flow in CyberChef and inspect how the Operations pane and Recipe pane are presented. Define a visual clue that makes the drag-and-drop interaction discoverable, then verify that a new user can identify how to begin without relying on About/Support.

Written by the indexing model from the issue text.