It's actually a collaborative repository, so that both of us in our company can improve the computer configuration, install new tools or language runtimes, etc etc.
The shared configuration has stuff like: our user accounts and public SSH keys; local mailer setup; firewall; conf for X/bash/emacs/ratpoison/tmux; list of installed packages (including Chromium, mplayer, nethack, etc); fonts and keymaps; various services (nssmdns, atd, redis, ipfs, tor, docker, ssh agent, etc); some cron jobs; a few custom package definitions; and some other stuff.
In Emacs, I use "use-package" for all external package requirements so that when I start the editor it installs all missing packages from ELPA/MELPA.
Aside from dealing with the binary WiFi blob this Dell computer demands, reinstalling was a pleasure.