update: readme 🔒

README.md

@@ -0,0 +1,34 @@
+# 🔒 Former Aiven Documentation
+
+> [!IMPORTANT]  
+> This repository used to be the main documentation of Aiven.
+>
+> The content has been migrated to https://github.com/aiven/aiven-docs.
+
+## Building the docs
+
+1. We recommend using a [virtual environment](https://docs.python.org/3/library/venv.html):
+
+   ```bash
+   python3 -m venv venv
+   ```
+
+1. Activate your virtual environment:
+
+   ```bash
+   source venv/bin/activate
+   ```
+
+1. Install the dependencies:
+
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+1. Build a local preview:
+
+   ```bash
+   make livehtml
+   ```
+
+See the output on [http://localhost:8000](http://localhost:8000).