Merge branch 'feature/guides' into 'dev'

backend/main.py

dockerfile

frontend/.env

frontend/package-lock.json

frontend/src/assets/guides/google/01_plus.png

frontend/src/assets/guides/thunderbird/01_nouvel_agenda.png

frontend/src/assets/guides/thunderbird/02_formulaire.png

frontend/src/components/Guide/Guide.tsx

frontend/src/components/Guide/guides/Apple.tsx

frontend/src/components/Guide/guides/Google.tsx

frontend/src/components/Guide/guides/Outlook.tsx

frontend/src/components/Guide/guides/Thunderbird.tsx

frontend/src/components/Guide/guides_md/apple.md

frontend/src/components/Guide/guides_md/google.md

frontend/src/components/Guide/guides_md/outlook.md

frontend/src/components/Guide/guides_md/thunderbird.md