docs: migrate to scriv to manage changelog

[BryanttV]

Description

This PR installs and configures scriv to manage the changelog file.

This PR is based on the Tutor repository configuration.

Testing instructions

You can test the scriv commands running their corresponding Makefile commands:

• make changelog-entry (Run scriv create): This command will create a file in the changelog.d folder. You must edit it to describe your changes. This file must be committed.

• make changelog (Run scriv collect): This command will update the CHANGELOG. The previous files in the changelog.d will be removed and their content will be added in the CHANGELOG. Later, you must create a new tag and push it to the remote. This will trigger the release.yml workflow to create a new GitHub Release with all changes described in the CHANGELOG.

Deadline

None

Other information

• Scriv Documentation
• docs: migrate to scriv to manage changelog overhangio/tutor#745

Checklists

Check off if complete or not applicable:

Merge Checklist:

• All reviewers approved
• Reviewer tested the code following the testing instructions
• CI build is green
• Version bumped
• Changelog record added with short description of the change and current date
• Documentation updated (not only docstrings)
• Integration with other services reviewed
• Fixup commits are squashed away
• Unit tests added/updated
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post Merge:

• Create a tag
• Create a release on GitHub
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

[openedx-webhooks]

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