Remove deprecation notice from README

[askpt]

Description:

Remove the deprecation notice from the README once the new package, with the new name, has been published.

• This task should only be completed after the new package is available on NuGet (or the relevant registry).
• Double-check that all references to the deprecated package name are removed or updated accordingly.

Steps:

1. Confirm the new package is published and available.
2. Update the README to remove the deprecation notice.
3. Ensure documentation and usage examples reference the new package name.