docs: i18n: Add complete French translation (#2073)
* docs: i18n(fr): add complete French translation
Add comprehensive French (fr-FR) translation covering all documentation
sections and website configuration:
- Core docs, How-to guides, Explanations, References
- Website config: astro.config.mjs locale setup, fr-FR.json i18n strings
- Assets: French workflow map diagram and quick-dev diagram
Terminology standardized on "Quick Dev" (replacing legacy "Quick Flow").
* docs(fr): remove references to deleted phase-4 agent personas
Remove all references to deleted phase-4 agent personas from French
documentation, matching upcoming PR #2020 changes:
- Remove agent personas: dev/Amelia, pm/John, qa/Quinn, sm/Bob,
quick-flow-solo-dev/Barry, bmad-master
- Replace deleted agent skill invocations with equivalent workflow skills
(bmad-dev-story, bmad-qa-generate-e2e-tests, bmad-quick-dev, etc.)
- Depersonalize QA references ("Quinn" → "QA Intégré" / "Workflow QA")
- Simplify workflow invocation instructions (remove "invoke agent" pattern)
- Fix upgrade-to-v6.md SM/Scrum Master references
* docs(fr): fix typos
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Co-authored-by: Alex Verkhovsky <alexey.verkhovsky@gmail.com>
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