Flatten directory structure and update documentation

- Moved all files from mac_os/ subdirectory to repository root
- Updated README.adoc to reflect simplified architecture
- Updated QUICK_INSTALL.md with all current apps
- Added claude-cli to install.sh and bin/install_homebrew_formulas
- Repository now shows clean file structure without nested mac_os folder
- Documentation now accurately describes opinionated installer approach

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

bin/install_basics

@@ -0,0 +1,8 @@
+#! /usr/bin/env bash
+
+# Installs basic system settings.
+
+printf "Installing custom fonts...\n"
+mkdir -p "$HOME/Library/Fonts"
+cp -n "$MAC_OS_PATH/fonts/"* "$HOME/Library/Fonts/" 2>/dev/null || true
+printf "Fonts installed.\n"