feat(distro): rename ISO targets and fix UEFI boot in live test script

- Rename installerIso and installerIsoGraphical to nomarchy-installer and nomarchy-live.
- Update host configurations with proper Nomarchy branding and volume IDs.
- Fix nomarchy-test-live-iso QEMU launch by using -drive if=pflash for UEFI firmware.
- Add nomarchy-build-live-iso utility script.
- Scrub remaining Omarchy references in Plymouth, installer messages, and docs.
- Regenerate docs/SCRIPTS.md to reflect new and renamed utilities.

themes/engine/plymouth/nomarchy.plymouth

@@ -1,6 +1,6 @@
 [Plymouth Theme]
 Name=Nomarchy
-Description=Omarchy splash screen.
+Description=Nomarchy splash screen.
 ModuleName=script
 
 [script]

themes/engine/plymouth/nomarchy.script

@@ -1,4 +1,4 @@
-# Omarchy Plymouth Theme Script
+# Nomarchy Plymouth Theme Script
 
 Window.SetBackgroundTopColor(0.101, 0.105, 0.149);
 Window.SetBackgroundBottomColor(0.101, 0.105,  0.149);