Importing Webamp from bundle inside a module

The [readme](https://github.com/captbaritone/webamp/blob/master/packages/webamp/docs/usage.md) mentions how to get started with Webamp in two situations: minimal, and with webpack.

As I mentioned on Discord, the example links are actually 404, so I'm not sure what they look like. But there's a tertiary option that might be mentioned: minimal, but with a `` tag. In this case, you need to `import()` Webamp:

```html
<script type="module">
await import('./webamp.bundle-1.5.0.js')

const container = document.querySelector('#container')
const webamp = new Webamp()
await webamp.renderWhenReady(container)

```

It might be worth mentioning this since it's otherwise not totally straightforward how to use the bundle file in an environment where a module is required.

Update packages/webamp/docs/usage.md; first read the existing minimal and webpack usage sections and check the example links mentioned in the issue. Add the module-script import case and ensure the documented examples no longer point to 404 links.

Written by the indexing model from the issue text.