Refactor experimental web3.js example with new helpers

[steveluscher]

Thanks for this example app! Here are some suggestions of how to refactor it for better developer ergonomics. There are still rough edges, to be sure, so keep sending feedback our way!

[loopcreativeandy]

Thanks for the suggestions!

I want to keep this file as-is such that people find the same version as in the video.

However, if you rename the file to experimental-improved.ts or something I'm happy to merge it in ;)

[steveluscher]

Done!