chore: Add blog post announcing the official deprecation of the project and update README accordingly (#7315)

Author: rm3l

README.md

@@ -1,6 +1,17 @@
 `odo` - Fast, Iterative and Simplified container-based application development
 ---
 
+> [!CAUTION]
+>
+> 📣 The `odo` project is **officially deprecated**, effective today (**Oct 23, 2025**). 📣
+>
+> You can find more information and dates in the following blog posts:
+> - [odo is deprecated](https://odo.dev/blog/odo-deprecation-announcement)
+> - [The odo CLI is deprecated: What developers need to know](https://developers.redhat.com/articles/2025/10/23/odo-cli-deprecated-what-developers-need-know)
+>
+
+---
+
 [![GitHub release](https://img.shields.io/github/v/release/redhat-developer/odo?style=for-the-badge)](https://github.com/redhat-developer/odo/releases/latest)
 ![License](https://img.shields.io/github/license/redhat-developer/odo?style=for-the-badge)
 [![Godoc](https://img.shields.io/badge/godoc-reference-007d9c?logo=go&logoColor=white&style=for-the-badge)](https://odo.dev/godoc)

docs/website/blog/2025-10-23-odo-deprecation-announcement.md

@@ -0,0 +1,13 @@
+---
+title: 📣 odo is deprecated 📣
+author: The odo Team
+image: https://raw.githubusercontent.com/redhat-developer/odo/main/docs/website/static/img/logo.png
+tags: ["deprecation"]
+slug: odo-deprecation-announcement
+---
+
+📣 The `odo` project is **officially deprecated**, effective today (**Oct 23, 2025**)! 📣
+
+<!--truncate-->
+
+You can find more information and dates in "[The odo CLI is deprecated: What developers need to know](https://developers.redhat.com/articles/2025/10/23/odo-cli-deprecated-what-developers-need-know)".