feat: Add script to generate plugin registry and documentation, including initial Mivo Theme plugin data and its mirrored documentation.

plugins/plugin-mivo-theme.md

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+---
+layout: doc
+title: "Mivo Theme Downloader"
+description: "Allows downloading the Captive Portal theme with auto-configuration."
+---
+
+# Mivo Theme Downloader
+
+**Category:** Hotspot Tools  
+**Author:** DyzulkDev  
+**Version:** 1.0.0
+
+The **Mivo Theme Downloader** allows you to easily download and install the latest Captive Portal themes directly from the Mivo settings panel.
+
+## Features
+- **One-Click Download**: Fetch the latest themes from the official repository.
+- **Auto-Extraction**: Automatically extracts and places theme files in the correct directory.
+- **Updates**: Keeps your hotspot login page up to date with new designs.
+
+## Installation
+1. Download the plugin ZIP file.
+2. Go to **Mivo > Settings > Plugins**.
+3. Click **Upload Plugin** and select the ZIP file.
+4. The plugin will appear in your installed list.
+
+## Usage
+Navigate to the **Theme Manager** in the sidebar (under Hotspot Tools) to browse and download available themes.
+
+---
+*This documentation is automatically mirrored from the [source repository](https://github.com/mivodev/plugin-mivo-theme).*