Big readme update and more

Updated readme with tons of information.
Made kazuki a hercules agent.
Fixed secrets ownerships.
Started working on a custom installer iso.
Changed helix theme.

hosts/installer/default.nix

@@ -0,0 +1,15 @@
+{lib, ...}: {
+  configurations.nixos = let
+    mkInstaller = system: ({pkgs, ...}: {
+      nixpkgs = {inherit system;};
+
+      environment.systemPackages = [pkgs.nixos-install-tools];
+
+      # Make nixos-anywhere treat this as a installer iso
+      system.nixos.variant_id = "installer";
+    });
+    systems = ["aarch64-linux" "x86_64-linux"];
+    installers = map (system: lib.nameValuePair "installer-${system}" (mkInstaller system)) systems;
+  in
+    lib.listToAttrs installers;
+}