Move the splash logo into resources/bg-skull.svg so it's tracked in git
and always available alongside the dotfiles. build.sh now copies
resources/ into /root/installer/resources/ on the ISO. The Plymouth
module resolves the SVG from the repo copy first, ISO copy second —
no user intervention or ~/Pictures setup required.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SyBNiWy3wpawrWb9ryVk7p
