dotfiles

chore: Add git signing & git gpg settings

chore: Update README and setup script to reflect removal of some repositories and clarify repository naming

chore: Update README and setup script to replace 'master' with 'main'

chore: Remove Mackup configuration and related references from setup and README since it's not compatible with modern macos. Delete legacy scripts for a cleaner setup process

chore: Enhance setup script with improved Homebrew and Bun installation checks, and add verification for aws-vault installation