[Bug]: Readme.md links to localhost

[parseb]

Current Behavior

Invalid link.
https://github.com/blocknative/web3-onboard/blob/3bf7c486477ba05da0808150504c23d4419423d3/README.md?plain=1#L126

Expected Behavior

Clicking "View demo app in browser" should deliver on its promise.

Steps To Reproduce

1. Click on link.
2. Be disappointed.

What package is effected by this issue?

@web3-onboard/core

Is this a build or a runtime issue?

N/A

Package Version

latest

Node Version

No response

What browsers are you seeing the problem on?

No response

Relevant log output

No response

Anything else?

No response

Sanity Check

• If this is a build issue, I have included my build config. If this is a runtime issue, I have included reproduction steps and/or a Minimal, Reproducible Example.

[Adamj1232]

@parseb it will work following the above steps to start the demo locally. We have clarified the README and it will be updated shortly in this PR #1447