Add MkDocs documentation portal with Material theme and CI/CD workflow

Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>

docs/plugins/actions/export-to-excel.md

@@ -0,0 +1,67 @@
+# Export to Excel
+
+<span class="category-badge action">Action</span>
+<span class="version-badge">v1.0.0</span>
+
+Export chat conversations to Excel spreadsheet format for analysis, archiving, and sharing.
+
+---
+
+## Overview
+
+The Export to Excel plugin allows you to download your chat conversations as Excel files. This is useful for:
+
+- Archiving important conversations
+- Analyzing chat data
+- Sharing conversations with colleagues
+- Creating documentation from AI-assisted research
+
+## Features
+
+- :material-file-excel: **Excel Export**: Standard `.xlsx` format
+- :material-table: **Formatted Output**: Clean table structure
+- :material-download: **One-Click Download**: Instant file generation
+- :material-history: **Full History**: Exports complete conversation
+
+---
+
+## Installation
+
+1. Download the plugin file: [`export_to_excel.py`](https://github.com/Fu-Jie/awesome-openwebui/tree/main/plugins/actions/export_to_excel)
+2. Upload to OpenWebUI: **Admin Panel** → **Settings** → **Functions**
+3. Enable the plugin
+
+---
+
+## Usage
+
+1. Have a conversation you want to export
+2. Click the **Export** button in the message action bar
+3. The Excel file will be automatically downloaded
+
+---
+
+## Output Format
+
+The exported Excel file contains:
+
+| Column | Description |
+|--------|-------------|
+| Timestamp | When the message was sent |
+| Role | User or Assistant |
+| Content | The message text |
+| Model | The AI model used (for assistant messages) |
+
+---
+
+## Requirements
+
+!!! note "Prerequisites"
+    - OpenWebUI v0.3.0 or later
+    - No additional Python packages required (uses built-in libraries)
+
+---
+
+## Source Code
+
+[:fontawesome-brands-github: View on GitHub](https://github.com/Fu-Jie/awesome-openwebui/tree/main/plugins/actions/export_to_excel){ .md-button }