Feature: Shared pacman options installed via system/install.sh

Enables Color through an Include snippet in /etc/pacman.d so pacman
options stay in sync between machines.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -46,6 +46,11 @@ stow -d ~/Projects/dotfiles/ -t ~/ dotfiles
 
 This will sync wallpapers/config files to where they are usually located
 
+System-level config (e.g. pacman options) lives in `system/` and is installed with sudo:
+```console
+~/Projects/dotfiles/system/install.sh
+```
+
 ## 📦 Programs
 
 List of programs and tools I use.