move all expressions to nix/; include modularized home-manager config

tests/buildvmwithbootloader/build-vm.sh

@@ -1,16 +0,0 @@
-#!/usr/bin/env bash
-set -x
-rm *.qcow2
-rm result*
-set -e
-
-BUILD_NIXPKGS="${BUILD_NIXPKGS:-${HOME}/src/github/NixOS/nixpkgs.dev}"
-NIXOS_CONFIG="${NIXOS_CONFIG_OVERRIDE:-${PWD}/configuration.nix}"
-
-nix-build -K --show-trace build-vm.nix \
-    --arg vmPkgsPath '<nixos-18.03>' \
-    --argstr buildPkgsPath "${BUILD_NIXPKGS}" \
-    --argstr nixosConfigPath "${NIXOS_CONFIG}" \
-    -A vmWithBootLoaderMixed
-
-./result/bin/run-*-vm