lite install for machines over ssh

[OmeGak]

dotfiles is growing quite a lot, as it's aiming to setup the whole system, and the initial install is anything but quick because it downloads a lot of things. This is quite a pain when you simply want to quickly have a comfortable environment over ssh. You could simply do make link but some .zsh files expect some packages to be already installed.

I see two ways to go, non-mutually exclusive:

1. Make those .zsh fail gracefully if the package is missing.
2. Have a way to specify a minimum set of dependencies that will be installed.

[OmeGak]

Or maybe this will be just enough: https://github.com/Russell91/sshrc