Support setting colors with a .hues.yml file
As seen in !3 (merged), people might have different expectations with the colors.
It would be nice to have a default .hues.yml
file in the spiro-deploy
repo, which can be overriden by _salt/.hues.yml
(for example?) in the repo being deployed, but the hues
documentation is mostly inexistent so I don't know how to go about that.