Clean up common user modules

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/configs/zsh/default.nix

@@ -0,0 +1,19 @@
+{ user ? throw "user argument is required" }: { ... }:
+
+{
+  home-manager.users."${user.name}" = {
+    programs.zsh = {
+      enable = true;
+      autocd = true;
+      history = {
+        path = "${user.home}/.local/share/zsh/history";
+        expireDuplicatesFirst = true;
+      };
+      historySubstringSearch.enable = true;
+      autosuggestion.enable = true;
+      syntaxHighlighting.enable = true;
+    };
+
+    home.persistence."/persist${user.home}".directories = [ ".local/share/zsh" ];
+  };
+}