Cross link to the demo from the bundle analyzer (#87290)

Drop some references so there is a plausible path to updating these in the future

Author: lukesandberg

apps/bundle-analyzer/README.md

@@ -12,3 +12,9 @@ This package is not published to npm. Instead it's built and vendored into the m
 - 🔍 **Dependency Tracking**: View import chains and dependency relationships
 - 🎨 **Filter Controls**: Filter by environment (client/server) and file types (JS/CSS/JSON/Assets)
 - 🔎 **Search Functionality**: Search through files in your bundle
+
+## Updating
+
+When landing non-trivial changes, consider updating the demo site:
+* Site: https://turbopack-bundle-analyzer-demo.vercel.sh/
+* Repo: https://github.com/vercel/turbopack-bundle-analyzer-demo