docs: rewrite README with comprehensive configuration overview

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -1,7 +1,87 @@
 # HakaseOS
-HakaseOS is an opinionated NixOS configuration heavily inspired by OmarchyOS.
+
+A modular, flake-based NixOS configuration for a single host (`hakase`).
 
 ## Features
-* Vim Keybindings
-* Hardened Firefox
 
+- **Hyprland** compositor with UWSM (systemd session management)
+- **Stylix** for automatic system-wide theming from wallpaper colors
+- **Hardened Firefox** with custom bookmarks and new tab page
+- **Vim keybindings** throughout the system
+- **SOPS** for encrypted secrets management
+- **CachyOS kernel** via chaotic-nyx for performance optimizations
+
+## Structure
+
+```
+.
+├── flake.nix                 # Flake inputs and NixOS configuration
+├── config.nix                # Central configuration values
+├── hosts/
+│   └── hakase/               # Host-specific configuration
+├── modules/
+│   ├── nixos/                # System-level modules (boot, kernel, services)
+│   └── home/                 # Home Manager modules
+├── apps/                     # Per-application configurations
+│   ├── hyprland/             # Hyprland window manager
+│   ├── waybar/               # Status bar
+│   ├── firefox/              # Browser configuration
+│   ├── ghostty/              # Terminal emulator
+│   ├── neovim/               # Editor (via nixovim flake)
+│   ├── walker/               # Application launcher
+│   └── ...                   # And many more
+├── secrets/                  # SOPS encrypted secrets
+└── assets/                   # Wallpapers and other assets
+```
+
+## Usage
+
+### Rebuild System
+
+```bash
+sudo nixos-rebuild switch --flake ~/.config/nixos/#hakase
+```
+
+Or use the configured alias:
+
+```bash
+update
+```
+
+### Manage Secrets
+
+```bash
+# Edit secrets
+nix-shell -p sops --run "sops secrets/secrets.yaml"
+
+# Update keys
+nix-shell -p sops --run "sops updatekeys secrets/secrets.yaml"
+```
+
+## Configuration
+
+Central configuration values are defined in `config.nix`:
+
+- `myConfig.nixos` - System settings (username, hostname, timezone)
+- `myConfig.git` - Git configuration
+- `myConfig.terminal` - Default terminal and aliases
+- `myConfig.hyprland` - Monitor configuration and wallpaper
+- `myConfig.firefox` - Bookmarks and new tab settings
+
+## Flake Inputs
+
+| Input | Description |
+|-------|-------------|
+| nixpkgs | NixOS unstable |
+| home-manager | User environment management |
+| hyprland | Wayland compositor |
+| chaotic | CachyOS kernel and packages |
+| sops-nix | Secrets management |
+| nixovim | Neovim configuration |
+| stylix | System-wide theming |
+| walker | Application launcher |
+| textfox | Firefox CSS theme |
+
+## License
+
+Personal configuration - use at your own discretion.