Use Grac as a CLI

Grac should be use not only in its own project, but also in new project and as a separate CLI.

Ex: New project with grac.jsonnet file.(default file)

grac deploy

This should create the target directory

Possibility to specify a directory for the config file.

grac deploy --config ./grac.jsonnet

NOTE: instance notion should be part of the config jsonnet file.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information