chore: initialize gentoo-setup documentation repository

Add comprehensive documentation for Lenovo ThinkPad Gentoo Linux setup
including:
- Complete system configuration guides (power, Bluetooth, WiFi, audio)
- Hardware setup documentation (touchpad, touchscreen, DisplayLink)
- Management scripts with ZSH completions
- Kernel configuration (6.12.41-gentoo-x86_64)
- Lid automation and monitor management
- Battery conservation system
- User guides and troubleshooting

Repository includes .gitignore to exclude logs, temporary files, and
secrets.

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

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

.gitignore

@@ -0,0 +1,33 @@
+# Build and log files
+logs/
+*.log
+
+# Temporary files
+*.tmp
+*.temp
+*.swp
+*.swo
+*~
+
+# Backup files
+*.bak
+*.backup
+*.old
+
+# OS-specific files
+.DS_Store
+Thumbs.db
+
+# Editor files
+.vscode/
+.idea/
+*.iml
+
+# Secrets and sensitive data
+*.key
+*.pem
+*.crt
+secrets/
+.env
+.env.*
+credentials.json