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/summary.md

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+# Summary
+
+<span class="category-badge action">Action</span>
+<span class="version-badge">v1.0.0</span>
+
+Generate concise summaries of long text content with key points extraction.
+
+---
+
+## Overview
+
+The Summary plugin helps you quickly understand long pieces of text by generating concise summaries with extracted key points. It's perfect for:
+
+- Summarizing long articles or documents
+- Extracting key points from conversations
+- Creating quick overviews of complex topics
+
+## Features
+
+- :material-text-box-search: **Smart Summarization**: AI-powered content analysis
+- :material-format-list-bulleted: **Key Points**: Extracted important highlights
+- :material-content-copy: **Easy Copy**: One-click copying of summaries
+- :material-tune: **Adjustable Length**: Control summary detail level
+
+---
+
+## Installation
+
+1. Download the plugin file: [`summary.py`](https://github.com/Fu-Jie/awesome-openwebui/tree/main/plugins/actions/summary)
+2. Upload to OpenWebUI: **Admin Panel** → **Settings** → **Functions**
+3. Enable the plugin
+
+---
+
+## Usage
+
+1. Get a long response from the AI or paste long text
+2. Click the **Summary** button in the message action bar
+3. View the generated summary with key points
+
+---
+
+## Configuration
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `summary_length` | string | `"medium"` | Length of summary (short/medium/long) |
+| `include_key_points` | boolean | `true` | Extract and list key points |
+| `language` | string | `"auto"` | Output language |
+
+---
+
+## Example Output
+
+```markdown
+## Summary
+
+This document discusses the implementation of a new feature 
+for the application, focusing on user experience improvements 
+and performance optimizations.
+
+### Key Points
+
+- ✅ New user interface design improves accessibility
+- ✅ Backend optimizations reduce load times by 40%
+- ✅ Mobile responsiveness enhanced
+- ✅ Integration with third-party services simplified
+```
+
+---
+
+## Requirements
+
+!!! note "Prerequisites"
+    - OpenWebUI v0.3.0 or later
+    - Uses the active LLM model for summarization
+
+---
+
+## Source Code
+
+[:fontawesome-brands-github: View on GitHub](https://github.com/Fu-Jie/awesome-openwebui/tree/main/plugins/actions/summary){ .md-button }