Clean up release notes for 0.9.1 (#232)

Author: llucax

RELEASE_NOTES.md

@@ -1,29 +1,5 @@
 # Frequenz Repository Configuration Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
-## Upgrading
-
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
-### Cookiecutter template
-
-<!-- Here upgrade steps for cookiecutter specifically -->
-
-## New Features
-
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
-### Cookiecutter template
-
-<!-- Here new features for cookiecutter specifically -->
-
 ## Bug Fixes
 
 - Fix that new repositories were initialized with the previous version 0.8.0.
-
-### Cookiecutter template
-
-<!-- Here bug fixes for cookiecutter specifically -->