chore: update the Readme file for migration (#787)

Signed-off-by: Leonardo Luz Almeida <[email protected]>

Author: leoluz

README.md

@@ -1,52 +1,9 @@
-# Ongoing migration 
-The gitops-engine repository is migrating to https://github.com/argoproj/argo-cd.
+# Update September 24th 2025
 
-As part of this migration, we are going to:
+This repository is now closed for new commits. The codebase and its git
+history have been migrated to the [Argo CD
+repository](https://github.com/argoproj/argo-cd) under the
+gitops-engine directory.
 
-- close PRs with no updates older than 1 year
-- ask ppl to update the remaining PRs that had some update in the last year but are outdated.
-- review the pending recent open PRs that we deem important
-
-Hold on your PRs until the migration is complete.
-
-# GitOps Engine
-
-Various GitOps operators address different use-cases and provide different user experiences but all have similar set of core features. The team behind
-[Argo CD](https://github.com/argoproj/argo-cd) has implemented a reusable library that implements core GitOps features:
-
-- Kubernetes resource cache ✅
-- Resources reconciliation ✅
-- Sync Planning ✅
-- Access to Git repositories
-- Manifest Generation
-
-## Proposals, specifications and ideas
-
-Do you want to propose one more feature and want to enhance the existing one?
-Proposals and ideas are in markdown docs in the [`specs/`](specs/) directory.
-To create a new proposal, simply copy the spec [`template`](specs/template.md),
-name the file corresponding to the title of your proposal, and place it in the
-`specs/` directory.
-
-A good starting point to understand the structure is the [GitOps Engine Design spec](specs/design.md).
-
-We tried to answer frequently asked question in a [separate FAQ document](docs/faq.md).
-
-## Governance
-
-This project is licensed under the [Apache 2 license](LICENSE).
-
-The GitOps Engine follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
-
-## Get involved
-
-If you are as excited about GitOps and one common engine for it as much as we are, please get in touch. If you want to write code that's great, if you want to share feedback, ideas and use-cases, that's great too.
-
-Find us on the [#argo-cd-contributors][argo-cd-contributors-slack] on CNCF Slack (get an [invite here][cncf-slack]).
-
-[argo-cd-contributors-slack]: https://cloud-native.slack.com/archives/C020XM04CUW
-[cncf-slack]: https://slack.cncf.io/
-
-### Contributing to the effort
-
-At this stage we are interested in feedback, use-cases and help on the GitOps Engine.
+If you have open PRs or Issues in this repo and believe it is
+important, please reopen it in Argo CD.