If it's the first time you check-out a repo you need to use --init first:

git submodule update --init --recursive

fonts

my ttf fonts

copy the fonts to ~/.fonts dir (if dir is not there create one)

$ cd ~/.fonts
$ mkfontscale
$ mkfontdir
$ ttmkfdir -o fonts.dir
$ fc-cache -f -v ~/.fonts
$ fc-cache -f -v
$ fc-match NonExistingFont   

You can confirm that the fonts are installed with the following command:

 $ fc-list | grep "Hack"

PS: The nerd-fonts submodule is really big

License

GPLv2+, just like Mercurial.