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/security/pwquality.conf

@@ -1,42 +0,0 @@
-# CIS Benchmark Password Policy
-# Implements CIS Debian Benchmark Section 5.4.1
-
-# ============================================================================
-# PAM Quality Requirements
-# ============================================================================
-
-# Minimum password length
-minlen = 14
-
-# Minimum number of lowercase characters
-lcredit = -1
-
-# Minimum number of uppercase characters
-ucredit = -1
-
-# Minimum number of digits
-dcredit = -1
-
-# Minimum number of special characters
-ocredit = -1
-
-# Maximum number of consecutive characters
-maxclassrepeat = 3
-
-# Maximum number of same consecutive characters
-maxrepeat = 3
-
-# Reject passwords containing the username
-usercheck = 1
-
-# Reject passwords containing common patterns
-enforce_for_root
-
-# Minimum number of character changes
-difok = 3
-
-# Check for common passwords
-dictcheck = 1
-
-# Reject passwords in dictionary
-authtok_type =