Add new server modules and configurations for various services

- Introduced `default-creds` module for managing default credentials with Umami integration.
- Added `fail2ban` module for brute-force attack protection with configurable ban times.
- Created `firewall` module to enable and configure basic firewall settings.
- Implemented `gitea` module for self-hosted Git service with PostgreSQL backend.
- Developed `glance` module for a customizable dashboard with various widgets and themes.
- Added `iknowyou` module for a self-hosted password manager with production and demo environments.
- Introduced `kernel-hardening` module for enhancing kernel security settings.
- Created `mazanoke` module for a simple web application with Nginx integration.
- Added `mealie` module for a self-hosted meal planning application.
- Implemented `stirling-pdf` module for PDF generation service.
- Developed `umami` module for self-hosted analytics with secret management.
- Added `ssh` module for secure SSH configuration with user restrictions.
- Introduced `nixy` theme for a customized aesthetic experience across services.

.github/assets/README_template.md

@@ -0,0 +1,134 @@
+<div align="center">
+    <img alt="nixy logo" src="./.github/assets/logo.png" width="120px" />
+</div>
+
+<br>
+
+# Nixy
+
+<br>
+<div align="center">
+    <a href="https://github.com/anotherhadi/nixy/stargazers">
+        <img src="https://img.shields.io/github/stars/anotherhadi/nixy?color={primarycolor}&labelColor={backgroundcolor}&style=for-the-badge&logo=starship&logoColor={primarycolor}">
+    </a>
+    <a href="https://github.com/anotherhadi/nixy/">
+        <img src="https://img.shields.io/github/repo-size/anotherhadi/nixy?color={primarycolor}&labelColor={backgroundcolor}&style=for-the-badge&logo=github&logoColor={primarycolor}">
+    </a>
+    <a href="https://nixos.org">
+        <img src="https://img.shields.io/badge/NixOS-unstable-blue.svg?style=for-the-badge&labelColor={backgroundcolor}&logo=NixOS&logoColor={primarycolor}&color={primarycolor}">
+    </a>
+    <a href="https://github.com/anotherhadi/nixy/blob/main/LICENSE">
+        <img src="https://img.shields.io/static/v1.svg?style=for-the-badge&label=License&message=MIT&colorA={backgroundcolor}&colorB={primarycolor}&logo=unlicense&logoColor={primarycolor}"/>
+    </a>
+</div>
+<br>
+
+**Nixy simplifies and unifies** the Hyprland ecosystem with a modular, easily
+customizable setup. It provides a structured way to manage your system
+configuration and dotfiles with minimal effort. It includes _home-manager_,
+_secrets_, and _custom theming_ all in one place.
+
+**Features:**
+
+- 💻 Hyprland & Caelestia: Preconfigured Hyprland ecosystem with Caelestia-shell (Ty to both projects!)
+- 🎨 Consistent Theming: Base16 & Stylix-powered themes
+- ⌨️ Vim-like Everywhere: Unified keybindings (Hyprland, nvim, vimium, etc.)
+
+## Table of Content
+
+{md_table_of_content}
+
+## Screenshots
+
+![Home](.github/assets/rose-pine/home.png)
+![Flake & Spotify](.github/assets/rose-pine/flake-spotify.png)
+![Browser and notification center](.github/assets/rose-pine/browser-and-notifications.png)
+
+## Architecture
+
+### 🏠 /home (User-level configuration)
+
+Contains **dotfiles and settings** that apply to your user environment.
+
+**Subfolders:**
+
+- `programs` is a collection of apps configured with home-manager
+- `system` is some "desktop environment" configuration
+
+### 🐧 /nixos
+
+Those are the system-level configurations. (audio, bluetooth, gpu, bootloader,
+...)
+
+### 🎨 /themes
+
+This folder contains all system themes. Mainly
+[stylix](https://stylix.danth.me/) configurations. Check out the available
+themes and learn how to create your own in [THEMES.md](docs/THEMES.md)
+
+### 💻 /hosts
+
+This directory contains host-specific configurations. Each host includes:
+
+- `configuration.nix` for system-wide settings
+- `home.nix` for user-level configuration
+- `variables.nix` for global variables
+- `secrets/` for sensitive data
+
+### 🖥️ /server-modules
+
+This folder contains server-related nixos modules. (bitwarden, nextcloud, ...)
+
+## Installation
+
+1. [Fork](https://github.com/anotherhadi/nixy/fork) this repo and clone it to
+   your system:
+
+```sh
+git clone https://github.com/anotherhadi/nixy ~/.config/nixos
+```
+
+2. Copy the `hosts/laptop` folder, rename it to match your system’s hostname,
+   and update `variables.nix` with your machine’s settings.
+3. Copy your `hardware-configuration.nix` into your new host's folder to ensure
+   proper hardware support.
+4. Register your new host in `flake.nix` by adding it under nixosConfigurations.
+
+> [!IMPORTANT]
+> `# CHANGEME` comments are placed throughout the config to
+> indicate necessary modifications. Use the following command to quickly locate
+> them:
+>
+> ```sh
+> rg "CHANGEME" ~/.config/nixos
+> ```
+
+> [!TIP]
+> When you add new files, don't forget to run `git add .` to add them to the git
+> repository
+
+5. Build the system
+
+```sh
+sudo nixos-rebuild switch --flake ~/.config/nixos#yourhostname
+```
+
+## Documentation
+
+- [SERVER](docs/SERVER.md): Check out the server documentation
+- [THEMES](docs/THEMES.md): How themes work and how to create your own
+- [WALLPAPERS](https://github.com/anotherhadi/awesome-wallpapers): An awesome
+  collection of wallpapers
+- [NEOVIM](docs/NEOVIM.md): How to use the Neovim config in your own flake
+- [GROUPS](docs/GROUPS.md): Reusable package groups (dev, cybersecurity)
+
+- [CONTRIBUTING](docs/CONTRIBUTING.md): How to contribute
+- [LICENSE](LICENSE): MIT License
+
+---
+
+<div align="center">
+  <a href="https://github.com/anotherhadi/nixy">github</a> |
+  <a href="https://gitlab.com/anotherhadi_mirror/nixy">gitlab (mirror)</a> |
+  <a href="https://git.hadi.icu/anotherhadi/nixy">gitea (mirror)</a>
+</div