Mention criticalup in the notes.

This slide is normally done live, but it's a note for the presenter that the install method shown will change in the future.
ferrous-systems · Sep 13, 2023 · 43fd201 · 43fd201
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 I use Docker for this. YMMV.
 
+## Installing in the future
+
+We have `criticalup` - like `rustup` but for fetching, verifying and installing
+digitally signed Ferrocene tarballs using your subscriber credentials.
+
+You can also use `criticalup` to fetch and verify the install tarballs, ready
+for transfer to a non-Internet-connected computer for installation there.