Update asset and entrypoint base URLs in index.html (#65)

Replaced hardcoded assetBase and added entrypointBaseUrl to use the value from cookiecutter.base_url. This improves configurability for different deployment environments.

{{cookiecutter.out_dir}}/web/index.html

@@ -25,7 +25,8 @@
       multiView: false,
       noCdn: "{{ cookiecutter.no_cdn }}".toLowerCase() == "true",
       webSocketEndpoint: "/ws",
-      assetBase: "/",
+      entrypointBaseUrl: "{{ cookiecutter.base_url }}",
+      assetBase: "{{ cookiecutter.base_url }}",
       routeUrlStrategy: "{{ cookiecutter.route_url_strategy }}",
       canvasKitBaseUrl: "/canvaskit/",
       pyodideUrl: "/pyodide/pyodide.js",