Fix simplest-way-to-start example & update README

[muayKenny]

Hello!

I was following the README to run the project locally and noticed a couple of outdated changes in the startup process.

Changes Made:

• index-simplest-way-to-start.html:

  • Updated to reflect that Scatterplot.ts is now a named import rather than a default export.
  • Adjusted the click_function override to properly expect a callback.

• README Update:

  • Changed the suggested localhost port in the README to align with port 3344 in the package.json dev script.

---

Important

Update index-simplest-way-to-start.html for named import and callback, and correct README port number.

• HTML Example Update:
  • In index-simplest-way-to-start.html, change Scatterplot import to named import.
  • Modify click_function to use a callback for logging datum.
• README Update:
  • Correct localhost port from 3345 to 3344 to match package.json dev script.

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