Add changelog entry to note image versioning

Author: danbarr

docs/about/changelog.md

@@ -4,5 +4,16 @@ description: History of notable updates and changes to CodeGate
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+- **Semantic versioning for container image** - 29 Dec, 2024\
+  CodeGate is now using semantic versioning for the container image, tied to
+  GitHub releases. We'll continue to highlight major features and changes here,
+  but to review all updates, see the
+  [GitHub Releases page](https://github.com/stacklok/codegate/releases).\
+  CodeGate is evolving quickly, so we still recommend pulling the `latest` tag
+  so you don't miss out on new features and improvements.
+
 - **Introducing CodeGate** - 17 Dec, 2024\
-  Initial public launch of CodeGate!
+  Initial public launch of CodeGate! Check out the
+  [blog post](https://stacklok.com/blog/productivity-and-privacy),
+  [website](https://codegate.ai/), and
+  [demo video](https://youtu.be/SkKX-Db_Leo) to learn more about the project.