Anonymize sensitive information and add SSH setup documentation

Documentation:
- Add comprehensive SSH key setup guide in docs/SSH-SETUP.md
- Add SSH configuration sections to README.md and QUICKSTART.md
- Replace specific provider examples with generic alternatives
- Remove Hetzner/BorgBase specific instructions for broader applicability

Anonymization:
- Remove company/project specific names (Agence66 → generic)
- Generalize service names (/srv/app → /srv/*)
- Remove detailed application lists (/opt/nextcloud, etc. → /opt/*)
- Replace specific usernames and hostnames with placeholders
- Change repository label from 'serveur' to 'production'

Files updated:
- README.md: Add SSH setup, anonymize content
- QUICKSTART.md: Add SSH configuration steps
- CHANGELOG.md: Generalize paths list
- config.yaml: Generic title and label
- install.sh: Remove branding
- scripts/healthcheck.sh: Remove branding
- docs/SSH-SETUP.md: New comprehensive SSH guide

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -27,19 +27,9 @@ Toutes les modifications notables de ce projet seront documentées dans ce fichi
 ### Chemins sauvegardés
 
 - `/var/www` - Sites web
-- `/srv/minecraftserver` - Serveur Minecraft
-- `/srv/reddiscordbot` - Bot Discord
-- `/srv/waltercoiffure` - Application Walter Coiffure
+- `/srv/*` - Services applicatifs
 - `/etc` - Configurations système
-- `/opt/nextcloud` - Nextcloud
-- `/opt/traefik` - Reverse proxy Traefik
-- `/opt/n8n` - Automation n8n
-- `/opt/portainer` - Gestion Docker
-- `/opt/uptime-kuma` - Monitoring
-- `/opt/vaultwarden` - Gestionnaire de mots de passe
-- `/opt/mailcow-dockerized` - Serveur mail
-- `/opt/netdata` - Monitoring système
-- `/opt/gitea` - Forge Git
+- `/opt/*` - Applications tierces
 - `/home` - Répertoires utilisateurs
 
 ### Compatibilité