Standardisation from process-bundle

[njoubert-cleverage]

Description

• Create main branch from latest *-dev branch and set it as default branch.
• Set Branch protection rule on "main" with "Require a pull request before merging"

As for process-bundle :

• Add/Update github workflows
• Update quality & tests stack
• Apply directory structure
• Update README
• Add/Update doc
• Add/Update CHANGELOG

Breaking changes