docs: add Keep a Changelog link (#9)

* fix: update changelog workflow

- Add force push for existing branches
- Improve error handling
- Add write permissions for pull requests
- Fix branch name handling

* docs: add Keep a Changelog link

Add reference to Keep a Changelog format in the automated changelog documentation.

Author: PeterVinter

README.md

@@ -88,6 +88,7 @@ This project uses an automated changelog workflow that:
 - Determines change type from PR title (feat, fix, docs, etc.)
 - Increments version number automatically
 - Creates a new PR with changelog updates
+- Follows [Keep a Changelog](https://keepachangelog.com/) format
 
 ### Automated Releases