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/index.md

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+# Action Plugins
+
+Action plugins add custom buttons below messages in the chat interface, allowing you to trigger specific functionalities with a single click.
+
+## What are Actions?
+
+Actions are interactive plugins that:
+
+- :material-gesture-tap: Add buttons to the message action bar
+- :material-export: Generate and export content (mind maps, charts, files)
+- :material-api: Interact with external services and APIs
+- :material-animation-play: Create visualizations and interactive content
+
+---
+
+## Available Action Plugins
+
+<div class="grid cards" markdown>
+
+-   :material-brain:{ .lg .middle } **Smart Mind Map**
+
+    ---
+
+    Intelligently analyzes text content and generates interactive mind maps with beautiful visualizations.
+
+    **Version:** 0.7.2
+
+    [:octicons-arrow-right-24: Documentation](smart-mind-map.md)
+
+-   :material-card-text:{ .lg .middle } **Knowledge Card**
+
+    ---
+
+    Quickly generates beautiful learning memory cards, perfect for studying and memorization.
+
+    **Version:** 0.2.0
+
+    [:octicons-arrow-right-24: Documentation](knowledge-card.md)
+
+-   :material-file-excel:{ .lg .middle } **Export to Excel**
+
+    ---
+
+    Export chat conversations to Excel spreadsheet format for analysis and archiving.
+
+    **Version:** 1.0.0
+
+    [:octicons-arrow-right-24: Documentation](export-to-excel.md)
+
+-   :material-text-box-search:{ .lg .middle } **Summary**
+
+    ---
+
+    Generate concise summaries of long text content with key points extraction.
+
+    **Version:** 1.0.0
+
+    [:octicons-arrow-right-24: Documentation](summary.md)
+
+</div>
+
+---
+
+## Quick Installation
+
+1. Download the desired plugin `.py` file
+2. Navigate to **Admin Panel** → **Settings** → **Functions**
+3. Upload the file and configure settings
+4. Use the action button in chat messages
+
+---
+
+## Development Template
+
+Want to create your own Action plugin? Use our template:
+
+```python
+"""
+title: My Custom Action
+author: Your Name
+version: 1.0.0
+description: Description of your action plugin
+"""
+
+from pydantic import BaseModel, Field
+from typing import Optional, Dict, Any
+
+class Action:
+    class Valves(BaseModel):
+        # Add your configuration options here
+        show_status: bool = Field(
+            default=True,
+            description="Show status updates during processing"
+        )
+    
+    def __init__(self):
+        self.valves = self.Valves()
+    
+    async def action(
+        self,
+        body: dict,
+        __user__: Optional[Dict[str, Any]] = None,
+        __event_emitter__: Optional[Any] = None,
+        __request__: Optional[Any] = None,
+    ) -> Optional[dict]:
+        """
+        Main action method triggered when user clicks the action button.
+        
+        Args:
+            body: Message body containing conversation data
+            __user__: Current user information
+            __event_emitter__: For sending notifications and status updates
+            __request__: FastAPI request object
+        
+        Returns:
+            Modified body dict or None
+        """
+        # Send status update
+        if __event_emitter__ and self.valves.show_status:
+            await __event_emitter__({
+                "type": "status",
+                "data": {"description": "Processing...", "done": False}
+            })
+        
+        # Your plugin logic here
+        messages = body.get("messages", [])
+        if messages:
+            last_message = messages[-1].get("content", "")
+            # Process the message...
+        
+        # Complete status
+        if __event_emitter__ and self.valves.show_status:
+            await __event_emitter__({
+                "type": "status",
+                "data": {"description": "Done!", "done": True}
+            })
+        
+        return body
+```
+
+For more details, check our [Plugin Development Guide](../../development/plugin-guide.md).