feat: update docs via LLM (#216)

vars/README.md

@@ -1,3 +1,47 @@
 # Variables
 
-Some common variables that I use in my NixOS configuration.
+Common variables and configuration used across my NixOS and nix-darwin configurations.
+
+## Current Structure
+
+```
+vars/
+├── README.md
+├── default.nix         # Main variables entry point
+└── networking.nix      # Network configuration and host definitions
+```
+
+## Components
+
+### 1. `default.nix`
+
+Contains user information, SSH keys, and password configuration:
+
+- User credentials (username, full name, email)
+- Initial hashed password for new installations
+- SSH authorized keys (main and backup sets)
+- Public key references for system access
+
+### 2. `networking.nix`
+
+Comprehensive network configuration including:
+
+- **Gateway settings**: Main router and proxy gateway configurations
+- **DNS servers**: IPv4 and IPv6 name servers
+- **Host inventory**: Complete mapping of all hosts with their network interfaces and IP addresses
+- **SSH configuration**: Remote builder aliases and known hosts configuration
+- **Network topology**: Physical machines, VMs, Kubernetes clusters, and SBCs
+
+## Host Categories
+
+The networking configuration covers:
+
+- **Physical machines**: Desktop PCs, Apple Silicon systems, SBCs
+- **Virtual machines**: KubeVirt guests, K3s nodes
+- **Kubernetes clusters**: Production and testing environments
+- **Network infrastructure**: Routers, gateways, and DNS configuration
+
+## Usage
+
+These variables are imported and used throughout the configuration to ensure consistency across all
+hosts and maintain centralized network and security settings.