docs: add notice about end of support (#4003)

Author: m1ghtym0

README.md

@@ -2,6 +2,11 @@
 
 # Always Encrypted Kubernetes
 
+> [!IMPORTANT]
+> **Constellation is no longer actively maintained by Edgeless Systems.**
+> 
+> This project is no longer receiving updates or support from Edgeless Systems. The repository remains available for archival purposes and community use.
+
 <p>
     <a href="https://github.com/edgelesssys/constellation/actions/workflows/test-tidy.yml/badge.svg?branch=main"><img src="https://github.com/edgelesssys/constellation/actions/workflows/test-tidy.yml/badge.svg?branch=main" alt="Govulncheck"></a>
     <a href="https://goreportcard.com/report/github.com/edgelesssys/constellation/v2"><img src="https://goreportcard.com/badge/github.com/edgelesssys/constellation/v2" alt="Go Report"></a>

dev-docs/howto/longhorn.md

@@ -1,6 +1,6 @@
 # Longhorn on Constellatioin
 
-To build Longhorn compatible images, apply the following changes. Those stem from [their installation guide](https://longhorn.io/docs/1.7.2/deploy/install/#installation-requirements).
+To build Longhorn compatible images, apply the following changes. Those stem from [their installation guide](https://longhorn.io/docs/1.10.0/deploy/install/#installation-requirements).
 
 ```diff
 diff --git a/image/mkosi.conf.d/azure.conf b/image/mkosi.conf.d/azure.conf

docs/docs/intro.md

@@ -4,6 +4,12 @@ id: intro
 ---
 # Introduction
 
+:::caution Maintenance Notice
+**Constellation is no longer actively maintained by Edgeless Systems.**
+
+This project is no longer receiving updates or support from Edgeless Systems. The repository and documentation remain available for archival purposes and community use.
+:::
+
 Welcome to the documentation of Constellation! Constellation is a Kubernetes engine that aims to provide the best possible data security.
 
 ![Constellation concept](/img/concept.svg)

docs/versioned_docs/version-2.24/intro.md

@@ -4,6 +4,12 @@ id: intro
 ---
 # Introduction
 
+:::caution Maintenance Notice
+**Constellation is no longer actively maintained by Edgeless Systems.**
+
+This project is no longer receiving updates or support from Edgeless Systems. The repository and documentation remain available for archival purposes and community use.
+:::
+
 Welcome to the documentation of Constellation! Constellation is a Kubernetes engine that aims to provide the best possible data security.
 
 ![Constellation concept](/img/concept.svg)