Windows: set hardware clock to UTC

reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation /v RealTimeIsUniversal /t REG_DWORD /d 0x1

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Windows UEFI: always load Grub instead of booting Windows automatically

bcdedit /set {bootmgr} path \EFI\ArchLinuxGrub\grubx64.efi