Allow to post/edit the changelog/announcements via API

I want to automatize our changelog/release notes process n CI, to do not depends on an user to collect every post and link with commits.

As we already have a changelog process in commits, we can create a code to link the changelog/commits from repo with clear flask and publish/edit/append the annoucements to users.

This is already possible. In the API, create what we call an "idea" with the category of a changelog. You can also inspect the network tab when you create a changelog through the dashboard. It's the same API.