message: docs: Add RedirectingHttpHandler entry to release notes
diff: ### New features
  - The server can be started with a new parameter to automatically generate accounts and pods,
  for more info see [here](guides/seeding-pods.md).
  +- A new `RedirectingHttpHandler` class has been added which can be used to redirect certain URLs.
  ### Configuration changes
  You might need to make changes to your v3 configuration if you use a custom config.
  