Ever-so-slightly clean up the build script and the readme in the nix/ folder

Although, not positive they work. Honestly have been more useful as a
way to remember what commands to run manually ^_^;

nix/README.md

@@ -1,5 +1,8 @@
 The install script is only for linux machines at the moment.
 
-For Apple machines, [install nix-darwin](https://github.com/LnL7/nix-darwin#install) and symlink the `darwin-configuration.nix` file to `~/.nixpkgs/darwin-configuration.nix`.
+For Apple machines, [install
+nix-darwin](https://github.com/LnL7/nix-darwin#install) and symlink the
+`darwin-configuration.nix` file (probably in `worktop`? why else would you have
+an OSX machine?) to wherever it needs to go for that version of nix-darwin.
 
-Home-manager is installed separately and not currently managed by the nix configurations.
+Home-manager is installed separately and not currently managed by any of the nix configurations.

nix/build.sh

@@ -6,11 +6,23 @@ install_home_manager() {
 
   export NIX_PATH=$HOME/.nix-defexpr/channels${NIX_PATH:+:}$NIX_PATH
   nix-shell '<home-manager>' -A install
+  mkdir -p ~/.config/home-manager
+
+  parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
+  cd "$parent_path"
+  [ -f ~/.config/home-manager/home.nix ] && mv ~/.config/home-manager/home.nix ~/.config/home-manager/home.nix.orig
+  ln -s ./home/commandline.nix ~/.config/home-manager/home.nix
+  home-manager switch
 }
 
 build_system() {
+  parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
+
   sudo nix-channel --add https://nixos.org/channels/nixos-unstable nixos
-  sudo cp system/configuration.nix /etc/nixos/
+  sudo ln -s "$parent_path/system/framework/configuration.nix" /etc/nixos/configuration.nix
 
   sudo nixos-rebuild switch --upgrade
 }
+
+build_system
+install_home_manager