Clear release notes (#139)

Author: llucax

RELEASE_NOTES.md

@@ -1,13 +1,29 @@
 # Frequenz Repository Configuration Release Notes
 
-## Bug Fixes
+## Summary
+
+<!-- Here goes a general summary of what this release is about -->
 
-- Update the version used in the documentation.
+## Upgrading
+
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
 
 ### Cookiecutter template
 
-- Update the generated version in dependencies.
-- Exclude `benchmarks/` directory from source distribution.
-- Use the native `navigation.indexes` extension from `mkdocs-material` instead of the `section-indexes` plugin.
+<!-- 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
+
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
+
+### Cookiecutter template
 
-  The plugin had some issues when failing to keep up to date.
+<!-- Here bug fixes for cookiecutter specifically -->