Add Bitwarden, setup script, remove redundant files, update disk requirements, and add LinuxServer preference

- Add Vaultwarden (Bitwarden) password manager to utilities.yml
  - Self-hosted password manager with web UI
  - SMTP configuration for email notifications
  - Admin token for management
  - Access at bitwarden.${DOMAIN}
  - Protected by Authelia SSO

- Create automated first-run setup script (scripts/setup-homelab.sh)
  - Installs Docker Engine and Compose V2
  - Configures user groups (sudo, docker)
  - Enables SSH for remote management
  - Detects NVIDIA GPU and provides manual driver installation instructions
  - Creates directory structure and Docker networks
  - Comprehensive instructions for post-setup deployment

- Remove redundant compose files (now in core.yml)
  - Deleted authelia.yml, duckdns.yml, gluetun.yml, traefik.yml
  - All services consolidated into unified core.yml stack
  - Eliminates confusion and duplication

- Update disk space requirements across documentation
  - Changed from "100GB+ system, 1TB+ media" to:
  - "120GB+ system drive (NVMe or SSD highly recommended)"
  - "2TB+ for media & additional disks for services like Nextcloud"
  - Updated in README.md and getting-started.md

- Add preference for LinuxServer.io images
  - Updated copilot-instructions.md
  - LinuxServer images support PUID/PGID for proper file permissions
  - Preference noted in consistency guidelines

- Update core stack documentation
  - Emphasize unified core.yml deployment
  - Add both deployment methods (cd to directory vs full path)
  - Update getting-started.md with correct deployment steps
  - Note removal of separate stack files

- Add Bitwarden environment variables to .env.example
  - BITWARDEN_ADMIN_TOKEN, SIGNUPS_ALLOWED, INVITATIONS_ALLOWED
  - SMTP configuration for email notifications
  - Generation instructions included

- Update services-reference.md
  - Add Vaultwarden to utilities section (now 7 services)
  - Update service count and access URLs

All documentation now consistent with unified core stack approach and includes all requested features.

Co-authored-by: kelinfoxy <67766943+kelinfoxy@users.noreply.github.com>

.github/copilot-instructions.md

@@ -26,6 +26,7 @@ You are an AI assistant specialized in managing Docker-based homelab infrastruct
 - Use the same network naming patterns
 - Maintain uniform volume mount structures
 - Apply consistent environment variable patterns
+- **Prefer LinuxServer.io images** when available (they support PUID/PGID for proper file permissions)
 
 ### 4. Stack-Aware Changes
 - Before making changes, consider the impact on the entire server stack
@@ -280,7 +281,7 @@ environment:
 
 ## Core Infrastructure Stack
 
-The `core` stack contains the four essential services that must be deployed **FIRST**:
+The `core` stack (located at `/opt/stacks/core/docker-compose.yml`) contains the four essential services that must be deployed **FIRST**:
 
 1. **DuckDNS** - Dynamic DNS updater for Let's Encrypt
 2. **Traefik** - Reverse proxy with automatic SSL certificates
@@ -292,15 +293,22 @@ The `core` stack contains the four essential services that must be deployed **FI
 - Simplifies initial deployment (one command)
 - Easier to manage core infrastructure together
 - Reduces network configuration complexity
+- All core services in `/opt/stacks/core/` directory
 
 **Deployment:**
 ```bash
+# From within the directory
 cd /opt/stacks/core/
 docker compose up -d
+
+# Or from anywhere with full path
+docker compose -f /opt/stacks/core/docker-compose.yml up -d
 ```
 
 All other stacks depend on the core stack being deployed first.
 
+**Note:** The separate `authelia.yml`, `duckdns.yml`, `gluetun.yml`, and `traefik.yml` files have been removed to eliminate redundancy. All these services are now in the unified `core.yml` stack.
+
 ## Toggling SSO (Authelia) On/Off
 
 You can easily enable or disable SSO protection for any service by modifying its Traefik labels.