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/common/default.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./hercules.nix
+  ];
+}

hosts/common/hercules.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  options.common.hercules.enable = lib.mkEnableOption "Enables hercules-ci-agent with my configuration";
+
+  config = lib.mkIf config.common.hercules.enable {
+    age.secrets.hercules-token = {
+      file = ../../secrets/hercules-token.age;
+      owner = config.systemd.services.hercules-ci-agent.serviceConfig.User;
+    };
+
+    services.hercules-ci-agent = {
+      enable = true;
+      settings = {
+        clusterJoinTokenPath = config.age.secrets.hercules-token.path;
+        concurrentTasks = lib.mkDefault 4;
+        binaryCachesPath = pkgs.writeText "empty-caches.json" "{}";
+      };
+    };
+  };
+}