Update readme with v2 GA announcement (#3457)

* Update readme with v2 GA announcement

Signed-off-by: Niels Bantilan <niels.bantilan@gmail.com>

* Update Flyte 2 announcement link in README

Updated the Flyte 2 announcement link in README.md.

---------

Signed-off-by: Niels Bantilan <niels.bantilan@gmail.com>

Author: cosmicBboy

README.md

@@ -1,8 +1,8 @@
 > [!IMPORTANT]
 > ## Looking for Flyte 2?
 >
-> - **⭐️ Flyte 2 Devbox is now available!** Check out the guide [here](https://www.union.ai/docs/v2/flyte/user-guide/run-modes/running-devbox/)
-> - **Use Flyte 2 locally?** Head to **[flyte-sdk](https://github.com/flyteorg/flyte-sdk)** — the new Python SDK for Flyte 2.
+> - **⭐️ Flyte 2 is now generally available!** Read more in the announcement [here](https://www.union.ai/blog-post/flyte-2-is-generally-available-the-durable-open-source-ai-runtime).
+> - **Want to try Flyte 2 locally?** Run the **[Devbox](https://www.union.ai/docs/v2/flyte/user-guide/get-started/run-modes/running-devbox/)** with the new Python SDK for Flyte 2.
 > - **Want to contribute to the Flyte 2 distributed backend?** See the **[`main` branch](https://github.com/flyteorg/flyte/tree/main)** of this repo.
 >
 > **The README below is for Flyte 1.x.**