Update react

I think the react examples could use an update. I was thinking something like this.

Here are the stuff my demo has:

• use context to hold gun object
• use hooks (useGun, and useCallback in examples, but also any other state/effects needed could go here)
• functional components
• modern tooling (I am using vite with swc in my example)
• CI build to github-pages by default

This style can be used for react-native as well as web-react, and makes everything simpler & easier to use.

I am happy to PR anything to modernize it. I noticed docs & examples have old class-components. Is there anywhere else? Where are docs source?