home.nix-index: remove dependency to stable nix #689

Job	Run time
nix (aarch64, fmt -- --check)	16s
nix (aarch64, eval .#apps.$_system.nixos-shell.program)	35s
nix (aarch64, eval .#apps.$_system.setup.program)	15s
nix (x86_64, fmt -- --check)	3m 41s
nix (x86_64, eval .#apps.$_system.nixos-shell.program)	2m 48s
nix (x86_64, eval .#apps.$_system.setup.program)	2m 46s
nix (build .#homeConfigurations."tobias@gamer".activationPackage, x86_64)	3m 24s
nix (build .#nixOnDroidConfigurations.pixel7a.activationPackage --impure, aarch64)	21m 19s
nix (build .#nixosConfigurations.argon.config.system.build.toplevel, aarch64, argon)	1s
nix (build .#nixosConfigurations.krypton.config.system.build.toplevel, x86_64, krypton)	4m 23s
nix (build .#nixosConfigurations.neon.config.system.build.toplevel, x86_64, neon, --async)	8m 33s
nix (build .#nixosConfigurations.xenon.config.system.build.toplevel, aarch64, xenon)	1s
	48m 2s

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