docs(changelog): mentioning the deprecation of this file (#217)

using the https://github.com/db-ui/elements/releases section from now on.

Author: mfranzke

CHANGELOG.md

@@ -2,7 +2,10 @@
 
 # Changelog
 
-All notable changes to this project will be documented in this file.
+| :point_up: | From now on we'll only document our changes within the [repositories releases page](https://github.com/db-ui/core/releases). |
+| ---------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+
+~All notable changes to this project will be documented in this file.~
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).