Refactor flakes

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

docs/GROUPS.md

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+# Groups
+
+Groups are curated sets of packages exposed as flake outputs. Each group has two forms:
+
+- **`homeManagerModules.<group>`** — full home-manager module (packages + files + systemd units)
+- **`packages.<group>`** — standalone environment for `nix shell` (packages only)
+
+## Available groups
+
+- dev (go, bun, air, ...)
+- cybersecurity (nmap, john, dirb, ffuf, ...)
+
+For the Cybersecurity group, the home-manager module also sets up:
+
+- `~/Cyber/wordlists/` with SecLists, fuzz4bounty, and hashcat rules
+- `~/Cyber/tmp/` as a temporary workspace
+
+## Use in another flake
+
+Add this repo as an input:
+
+```nix
+inputs.nixy.url = "github:anotherhadi/nixy";
+```
+
+Import the home-manager module in your home configuration:
+
+```nix
+{ inputs, ... }: {
+  imports = [
+    inputs.nixy.homeManagerModules.cybersecurity
+    # inputs.nixy.homeManagerModules.dev
+  ];
+}
+```
+
+## Quick shell without installing
+
+```sh
+nix shell github:anotherhadi/nixy#cybersecurity
+nix shell github:anotherhadi/nixy#dev
+```
+
+This drops you into a shell with all tools in `PATH`. No home-manager required, no wordlists or systemd units.