Continue moving personal packages from overlays

Continue moving out of the overlay model for everything and into running
sutff directly out of the packages. This should give a cleaner
separation of the things that I don't need to maintain separately

pkgs/inject.nix

@@ -0,0 +1,56 @@
+{ writeShellApplication, git, ... }:
+
+writeShellApplication {
+  name = "inject-nixos-config";
+  runtimeInputs = [ git ];
+  text = ''
+    hostname="''${1}"
+    if [ -n "''${hostname}"]; then
+      echo "You must provide a hostname";
+      exit 1;
+    fi
+
+    mv /etc/nixos /etc/nixos.bk
+    cd /etc
+    git clone http://github.com/greg-hellings/nixos-config nixos
+    mkdir -p "/etc/nixos/hosts/''${hostname}"
+
+    # Prepares everything for the flake usage
+    #cp /etc/nixos.bk/configuration.nix "/etc/nixos/hosts/''${hostname}/default.nix"
+    cat << EOF > "/etc/nixos/hosts/''${hostname}/default.nix"
+    { pkgs, config, ... }:
+
+    {
+      imports = [ ./hardware-configuration.nix ];
+
+      boot.loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+
+      networking.hostName = "''${hostname}";
+      greg = {
+        home = true;
+        tailscale.enable = true;
+      };
+    }
+    EOF
+    cp /etc/nixos.bk/hardware-configuration.nix "/etc/nixos/hosts/''${hostname}/hardware-configuration.nix"
+
+    # Prepare home-manager portion for setup
+    mkdir -p "/etc/nixos/home/hosts/''${hostname}"
+    cat << EOF > "/etc/nixos/home/hosts/''${hostname}/default.nix"
+    { pkgs, config, ... }:
+
+    {
+    }
+    EOF
+
+    # Prepares it for injecting the use case into the flake usage
+    cp /etc/nixos.bk/hardware-configuration.nix /etc/nixos
+    chown -R greg nixos
+
+    echo "Now you should be able to just run `nixos-rebuild switch` to enable the flake functionality"
+    echo "After that and adding the entry to the flake, run `nixos-rebuild boot --flake '.#''${hostname}'` and reboot"
+  '';
+}