Clear release notes

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -2,39 +2,16 @@
 
 ## Summary
 
-This release is a major step and adds many features and breaking changes.
+<!-- Here goes a general summary of what this release is about -->
 
 ## Upgrading
 
-Since this project is still in heavy development, the easiest way to upgrade is
-to regenerate the templates. Please follow the instructions in the new
-documentation website about [updating
-projects](https://frequenz-floss.github.io/frequenz-repo-config-python/next/#update-an-existing-project).
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with --> 
 
 ## New Features
 
-This is just a quick (non-comprehensive) summary of the new features:
-
-* Add `--diff` as a default argument for `isort`
-* Improve `README`
-* Don't import modules into packages
-* Support migrating and updating existing projects with Cookiecutter
-* Cookiecutter template
-
-  * Add `dependabot` configuration
-  * Add issue templates, keyword labeler, and PR labeler
-  * Add `CODEOWNERS` file
-  * Add `direnv`-related files to `.gitignore`
-  * Add GitHub CI workflow to `cookiecutter`
-  * Add `CONTRIBUTING` guide to `cookiecutter`
-  * Add `RELEASE_NOTES` to `cookiecutter`
-  * Add support to generate documentation using `mkdocs`
-
-* Apply all the Cookiecutter template improvements to this project
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes
 
-This is just a quick (non-comprehensive) summary of bug fixes:
-
-* Fix some comments about creating labels
-* Fix tests
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->