_scripts: rewrite generate release notes into Python (#837)

Most of our team knows Python better then Ruby, so it will be easier to
enhance edit and fix the script written in Python. This also removes the
need to run it with a Ruby development container.

Signed-off-by: Freya Gustavsson <[email protected]>
Co-authored-by: Freya Gustavsson <[email protected]>

Author: jelly

README.md

@@ -216,6 +216,19 @@ All blog posts belong in the `_posts` directory and must be formatted with the y
 
 In addition, every blog post needs to have Frontmatter including the fields `title` and `date` (which should be the same as the filename's date) and should also include `author` to give the person credit (as well as to show up under the author on the authors page). In addition, a blog post may have `tags` and a `category`, but they're not necessary (only suggested).
 
+To make this process easier we have `_scripts/generate-release-notes` which will take release notes from all our Cockpit repos and generate a blog post for you.
+
+```bash
+_scripts/generate-release-notes --user YourAuthorName
+```
+
+For all arguments check `--help` section
+
+```bash
+_scripts/generate-release-notes --help
+```
+
+
 #### Blog Authors
 
 While not necessary, it is suggested to use nicknames for authors in the Frontmatter of blog posts.