refactor: Complete directory cleanup

Finalizes directory cleanup by removing obsolete files:
- All old debootstrap build scripts (docker-*.sh, final-simple-build.sh)
- All old documentation from root (BUILD-*.md, DOCKER-*.md)
- Obsolete Dockerfiles (Dockerfile, Dockerfile.build)
- Obsolete chroot-overlay/ directory (now using preseed.cfg)
- Old build.sh (replaced by scripts/build-iso.sh)

All files are now in proper directories:
- scripts/: Build and test scripts
- docs/: All documentation
- config/: Configuration files
- logs/: Log files
- keys/: WireGuard keys

Repository is clean and ready for production.

💘 Generated with Crush

Assisted-by: Gemini 2.5 Flash via Crush <crush@charm.land>

chroot-overlay/etc/wireguard/wg0.conf.template

@@ -1,19 +0,0 @@
-# WireGuard configuration for football system
-# ALL TRAFFIC MUST GO THROUGH THIS TUNNEL
-# Template - will be configured during build
-
-[Interface]
-# Private key - MUST be set during deployment
-PrivateKey = <PRIVATE_KEY_PLACEHOLDER>
-# WireGuard interface IP (within the VPN)
-Address = 10.100.0.2/24
-# DNS via VPN
-DNS = 10.100.0.1
-
-[Peer]
-# VPN server endpoint
-PublicKey = <PUBLIC_KEY_PLACEHOLDER>
-Endpoint = <ENDPOINT_IP>:<ENDPOINT_PORT>
-AllowedIPs = 0.0.0.0/0, ::/0
-# Keep connection alive
-PersistentKeepalive = 25