No need to explicitly list kali-themes in the packages to install, it's
pulled in anyway via the following dependency chain: kali-desktop-i3 ->
kali-desktop-core -> kali-themes
I removed the pulseaudio hook. I really don't see a reason to start
pulseaudio once, during the build process, as root. Plus, the second
line of the hook (rm -rf .pulse-cookieaa) has no effect, since there's
no file named .pulse-cookieaa. I added some debug logs to the hook to
confirm that.