Add Connection Button Example

[niklasp]

eg this one in a simplified version

https://github.com/scio-labs/inkathon/blob/main/frontend/src/components/web3/connect-button.tsx

It helps frontend devs that are just using useInkathon for their dapps

[wottpal]

Really like this idea, @niklasp. We could extend examples/react-ts for this, wdyt? Open for PRs here as well :)

[niklasp]

just wanted to address this, the current state of the example app is this

The second dropdown does not really make sense to me, shall I update the example to mirror the inkathon frontend more? Shall I also use shadcn? Or keep it as minimal as possible? Whats your opinions?