"Evaluate" option in REPL doesn't work for me

It looks like `bundle.run` is down, so `https://bundle.run/@babel/polyfill@7` fails to load, which breaks the REPL for me 😢

Is there a reason this uses `bundle.run` specifically, or can it be switched to jsdelivr or Unpkg? Both of them work fine:
- https://cdn.jsdelivr.net/npm/@babel/polyfill@7/dist/polyfill.min.js
- https://unpkg.com/@babel/polyfill@7/dist/polyfill.min.js

Start by locating the REPL implementation that loads https://bundle.run/@babel/polyfill@7 and inspect how the Evaluate option depends on it. Compare the working jsDelivr and Unpkg URLs mentioned in the issue, then verify that Evaluate loads successfully with the selected replacement. Done means the REPL no longer fails because bundle.run is unavailable.

Written by the indexing model from the issue text.