refactor: added archive header to repo

Author: destrex271

README.md

@@ -1,3 +1,6 @@
+
+> ⚠️ **Archived Repository** — The contents of this project have been moved to [pgwatch-contrib](https://github.com/cybertec-postgresql/pgwatch-contrib) to have a unified place for everything related to pgwatch that cannot be merged into upstream.
+
 [![Tests](https://github.com/destrex271/pgwatch3_rpc_server/actions/workflows/test.yml/badge.svg)](https://github.com/destrex271/pgwatch3_rpc_server/actions/workflows/test.yml)
 [![Coverage Status](https://coveralls.io/repos/github/destrex271/pgwatch3_rpc_server/badge.svg?branch=main)](https://coveralls.io/github/destrex271/pgwatch3_rpc_server?branch=main)
 ![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/destrex271/pgwatch3_rpc_server)
@@ -73,4 +76,4 @@ You can also look at our example sinks to help with your implementation or exten
 - [Parquet Receiver](/cmd/parquet_receiver/README.md): Store measurements in Parquet files.
 - [ClickHouse Receiver](/cmd/clickhouse_receiver/README.md): Store measurements in OLAP databases like ClickHouse for analytics.
 - [LLama Receiver](/cmd/llama_receiver/README.md): Gain performance insights and recommendations from your measurements using `tinyllama`.
-- [S3 Receiver](/cmd/s3_receiver/README.md): Store measurements in AWS S3.
+- [S3 Receiver](/cmd/s3_receiver/README.md): Store measurements in AWS S3.