Add updated readme to webamp-demo package

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: captbaritone

packages/webamp-demo/readme.md

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+# Webamp.org
+
+The Webamp demo site, [webamp.org](https://webamp.org), uses the same interface as the NPM module but adds the following functionality by utilizing Webamp's public API
+
+- Error reporting using [Sentry](https://sentry.io)
+- Analytics using [Google Analytics](https://analytics.google.com/analytics/web/)
+- Updating document's title to reflect the currently playing track
+- [Media Session API](https://developer.mozilla.org/en-US/docs/Web/API/Media_Session_API) integration
+
+Additionally, it makes use of some private Webamp APIs to add the following functionality:
+
+- [Butterchurn](https://github.com/jberg/butterchurn) integration to render [MilkDrop](https://en.wikipedia.org/wiki/MilkDrop) visualizations. We intend to make this part of the public API soon.
+- "Screenshot" mode `https://webamp.org/?screenshot=1` which can be used together with [Puppeteer](https://github.com/GoogleChrome/puppeteer) to automate the generation of Winamp skin screenshots
+
+## Development
+
+    pnpm start
+
+## Production Builds
+
+To do an optimized build of the demo site:
+
+    pnpm run build
+
+To test the production build locally:
+
+    pnpm run serve
+
+## Deploying
+
+[Netlify](https://www.netlify.com/) watches GitHub for new versions of master. When a new version is seen, it is automatically built and pushed to the server. Additionally, Netlify will run a build on every pull request and include a link under the heading "Deploy preview ready!".
+
+In short, deploying should be as simple as pushing a commit to master.
+
+### Advanced Usage
+
+There are some "feature flags" which you can manipulate by passing a specially crafted URL hash. Simply supply a JSON blob after the `#` of the URL to change these settings:
+
+- `skinUrl` (string) Url of the default skin to use. Note, this file must be served with the correct Allows Origin header.
+- `audioUrl` (string) Url of the default audio file to use. Note, this file must be served with the correct Allows Origin header.
+- `initialState` (object) Override the initial Redux state. Values from this object will be recursively merged into the actual default state.
+
+**Note:** These are intended mostly as development tools and are subject to change at any time.