Doc; refactor dev files to be used in mkdocs documentation (!1303) · Merge requests · vidjil / vidjil · GitLab

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GitLab upgrade completed. Current version is 18.3.6
https://about.gitlab.com/releases/2025/07/17/gitlab-18-2-released/
https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/

Last part of mkdocs material conversion: dev files.