Remove React warnings

[catarak]

How would this new feature help increase access to the p5.js Editor?

Improves stability of the application.

Feature enhancement details:

When running the p5.js Editor locally, React outputs to the console some deprecation warnings, due to updating the React version. I would like to fix these warnings in an attempt to keep React up to date.

[raclim]

Closing as addressed, as the warnings are no longer appearing in the console.