Adding bouncing ball react-spring example

[Misterlinux]

Why

Adding a demo for the react-spring controller section

What

Added a Codesandbox Demo to the react-spring examples.

Checklist

• Documentation updated
• Demo added
• Ready to be merged

Feel free to message me in case any edit is needed to my code

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Latest commit: 7dcd1be

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Name	Status	Preview	Comments	Updated (UTC)
react-spring	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 20, 2023 10:32am

[joshuaellis]

This example appears to use non-english variable names and uses bootstrap-css which isn't something we really feel the need to advocate in addition it's not up to a standard I would expect e.g. not using jsx files and using @react-spring/animated directly.