Fix JSON error in docs

[MichaelCurrin]

In Bundle Mode of README.md, I see this

{
    "imports": {
        "https://esm.sh/": "https://esm.sh/[react,react-dom,swr]/",
        ...
    }
}

Which causes markdown error validation on ...

You can comment this out, but JSON does not allow comments so you'll still an error.

Solution: Use json5 syntax which supports comments.

```json5
{
    "imports": {
        "https://esm.sh/": "https://esm.sh/[react,react-dom,swr]/",
        // ...
    }
}
```

{
    "imports": {
        "https://esm.sh/": "https://esm.sh/[react,react-dom,swr]/",
        // ...
    }
}

[ije]

@MichaelCurrin thanks, i just removed the json lang specifier.

[MichaelCurrin]

Using json5 will keep the syntax highlighting, which is gone now.