chore: prune obsolete documentation and consolidate

- Remove obsolete plans/ directory (AI orchestrator moved to separate services)
- Remove docs/sessions/ (historical session notes)
- Remove docs/reference/ (duplicated in CONTAINERS.md)
- Remove docs/architecture/ (duplicated in CONTAINERS.md)
- Remove maintenance stack and backup-procedures guide (decommissioned)
- Remove scripts/ directory (unused)
- Fold EXTERNAL_SERVICES.md into CONTAINERS.md
- Update Nextcloud to reflect PostgreSQL shared (was MariaDB)
- Clean up README.md links

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

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

README.md

@@ -1,48 +1,23 @@
 # portainer-core
 
-> Self-hosted home server infrastructure with GPU-accelerated ML, AI orchestration, media streaming, and secure remote access
+> Self-hosted home server infrastructure with GPU-accelerated ML, media streaming, and secure remote access
 
 **Main Dashboard:** https://home.schweitz.net (Organizr)
 
 ## Quick Links
 
-### Getting Started
-- [System Specifications](docs/reference/SYSTEM.md) - Hardware and software details
-- [Container Reference](docs/reference/CONTAINERS.md) - All deployed services
-- [Current Status](STATUS.md) - Implementation progress and phase tracking
+### Documentation
 
-### Implementation Plans
-- [Implementation Plans](PLANS.md) - Master plan tracker
-- [Active Plans](plans/active/) - Current development work
-- [Completed Plans](plans/completed/) - Historical implementations
-
-### Documentation Index
-
-#### Architecture & Design
-- [Shared Infrastructure Architecture](docs/architecture/SHARED_INFRASTRUCTURE_ARCHITECTURE.md) - PostgreSQL/Redis shared infrastructure
-
-#### Operational Guides
-- [Backup Procedures](docs/guides/backup-procedures.md) - Backup strategies and procedures
-- [Code-Server Setup](docs/guides/code-server-setup.md) - Browser-based IDE configuration
-- [Connect Devices Guide](docs/guides/connect-devices-guide.md) - Headscale VPN setup
-- [GPU Docker Configuration](docs/guides/gpu-docker-config.md) - NVIDIA GPU passthrough
-- [Headscale Setup](docs/guides/headscale-setup.md) - Mesh VPN deployment
-- [NPM Logging Guide](docs/guides/npm-logging-guide.md) - Nginx Proxy Manager logging
-
-#### Services
-- [Organizr Widgets](docs/services/organizr-widgets.md) - Service control dashboard
-- [External Services](docs/EXTERNAL_SERVICES.md) - Services in separate repositories
-
-#### Reference
-- [Stacks Reference](docs/reference/stacks.md) - All Docker Compose stacks
-- [Scripts Reference](docs/reference/scripts.md) - Maintenance automation
-- [Automation Reference](docs/reference/AUTOMATION.md) - Portainer REST API usage
-- [Container Reference](docs/reference/CONTAINERS.md) - Complete container profiles
-- [System Reference](docs/reference/SYSTEM.md) - Hardware specifications
+- [Container Reference](CONTAINERS.md) - All services, ports, configuration
 - [Changelog](CHANGELOG.md) - Version history
+- [Agent Guidelines](AGENTS.md) - For LLM coding agents
 
-### For AI Agents
-- [Agent Guidelines](AGENTS.md) - **REQUIRED READING** for all LLM coding agents
+#### Guides
+- [GPU Docker Configuration](docs/guides/gpu-docker-config.md)
+- [Headscale VPN Setup](docs/guides/headscale-setup.md)
+- [Connect Devices to VPN](docs/guides/connect-devices-guide.md)
+- [Code-Server Setup](docs/guides/code-server-setup.md)
+- [NPM Logging](docs/guides/npm-logging-guide.md)
 
 ## Architecture Overview