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>

docs/getting-started.md

@@ -11,7 +11,7 @@ Before you begin, ensure you have:
 - [ ] Docker Compose V2 installed
 - [ ] Git installed
 - [ ] At least 8GB RAM (16GB+ recommended)
-- [ ] Sufficient disk space (100GB+ system, 1TB+ for media recommended)
+- [ ] Sufficient disk space: 120GB+ system drive (NVMe or SSD highly recommended), 2TB+ for media & additional disks for services like Nextcloud that require lots of space
 - [ ] Static IP address for your server (or DHCP reservation)
 - [ ] DuckDNS account (free) with a domain
 - [ ] Surfshark VPN account (optional, for VPN features)
@@ -174,10 +174,14 @@ nano users_database.yml
 # Copy .env file to core stack
 cp ~/AI-Homelab/.env /opt/stacks/core/.env
 
-# Deploy the entire core stack
+# Deploy the entire core stack - use either method:
+# Method 1: From within directory
 cd /opt/stacks/core
 docker compose up -d
 
+# Method 2: From anywhere with full path
+docker compose -f /opt/stacks/core/docker-compose.yml up -d
+
 # Check logs to ensure everything is running
 docker compose logs -f
 
@@ -198,31 +202,6 @@ docker compose logs -f
 - If Authelia won't start, check your password hash and configuration.yml
 - If Gluetun fails, verify your Surfshark credentials in .env
 
-```bash
-# Create stack directory
-mkdir -p /opt/stacks/infrastructure
-
-# Copy compose file
-cp ~/AI-Homelab/docker-compose/infrastructure.yml /opt/stacks/infrastructure/docker-compose.yml
-
-# Create necessary subdirectories
-mkdir -p /opt/dockge/data
-mkdir -p /opt/stacks/pihole/{etc-pihole,etc-dnsmasq.d}
-mkdir -p /opt/stacks/glances/config
-
-# Copy .env
-cp ~/AI-Homelab/.env /opt/stacks/infrastructure/.env
-
-# Deploy Dockge first
-cd /opt/stacks/infrastructure
-docker compose up -d dockge
-
-# Access Dockge at https://dockge.yourdomain.duckdns.org
-
-# Deploy remaining infrastructure services
-docker compose up -d
-```
-
 ## Step 8: Deploy Infrastructure Services (Dockge)
 
 ```bash