Adds file extension to git configs
Adds init files for zshrc
Adds zsh-syntax-highlighting plugin
Updates .zshrc to use external files
Adds last-run script to source auto-update if it hasn't been run in a while
Changes run-once.zsh to be executable
Adds some shortcuts and vars to clean things up in auto-update.zsh
Simplifies post-update.zsh by using some global helper functions
Adds helper functions to psyrendust-procedure-init.zsh
Adds function names to bootstrap-shell.zsh