message: fix(lambda-at-edge): fix ISR issue with index.ts
  For the root path `/` the `s3StorePage` was not correctly storing to the index.html file and instead was storing as `.html`
  Added an extra regex replace() to deal with the root path.
diff: @@ -30,6 +30,7 @@ export const s3StorePage = async (
  ? `${options.basePath.replace(/^\//, "")}/`
  : "";
  const baseKey = options.uri
  + .replace(/^\/$/, "index")
  .replace(/^\//, "")
  .replace(/\.(json|html)$/, "")
  .replace(/^_next\/data\/[^\/]*\//, "");
  