revamp of nix organization

nix/home/programs/zsh/default.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+
+with builtins; {
+
+  programs.zsh = {
+    enable = true;
+    enableCompletion = true;
+    defaultKeymap = "viins";
+
+    initExtra = readFile ./zshrc;
+
+    oh-my-zsh = {
+      enable = true;
+      theme = "typewritten";
+      custom = "$HOME/.oh-my-zsh/custom";
+      plugins = [
+        "vi-mode"
+        "git"
+        "z"
+      ];
+    };
+  };
+
+  home.file.".oh-my-zsh/custom/themes/typewritten.zsh-theme" = {
+    source = ./typewritten.zsh-theme;
+  };
+}