Update CHANGELOG for version 0.3.0

Added new version 0.3.0 with roles and documentation updates. Fixed image links and spelling mistakes.

Signed-off-by: JTH <git4jth@eacg.de>

Author: jthDEV

CHANGELOG.md

@@ -7,6 +7,16 @@ 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).
 
+## 0.3.0 10-03-2026
+
+### Added
+* added new roles
+* new zensical replacing mkdocs for documentation
+
+### Fixed
+* some image links (most likely due to change from mkdocs to Zensical) and spelling mistakes
+
+
 ## 0.2.0 13-05-2024
 
 ### Added