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/pipelines/index.md

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+# Pipeline Plugins
+
+Pipelines are complex workflows that combine multiple processing steps for advanced use cases.
+
+## What are Pipelines?
+
+Pipelines extend beyond simple transformations to implement:
+
+- :material-workflow: Multi-step processing workflows
+- :material-source-merge: Model orchestration
+- :material-robot-industrial: Advanced agent behaviors
+- :material-cog-box: Complex business logic
+
+---
+
+## Available Pipeline Plugins
+
+<div class="grid cards" markdown>
+
+-   :material-view-module:{ .lg .middle } **MoE Prompt Refiner**
+
+    ---
+
+    Refines prompts for Mixture of Experts (MoE) summary requests to generate high-quality comprehensive reports.
+
+    **Version:** 1.0.0
+
+    [:octicons-arrow-right-24: Documentation](moe-prompt-refiner.md)
+
+</div>
+
+---
+
+## How Pipelines Differ
+
+| Feature | Filters | Pipes | Pipelines |
+|---------|---------|-------|-----------|
+| Complexity | Simple | Medium | High |
+| Use Case | Message processing | Model integration | Multi-step workflows |
+| Execution | Before/after LLM | As LLM | Custom orchestration |
+| Dependencies | Minimal | API access | Often multiple services |
+
+---
+
+## Quick Installation
+
+1. Download the pipeline `.py` file
+2. Navigate to **Admin Panel** → **Settings** → **Functions**
+3. Upload and configure required services
+4. Enable the pipeline
+
+---
+
+## Development Considerations
+
+Pipelines often require:
+
+- Multiple API integrations
+- State management across steps
+- Error handling at each stage
+- Performance optimization
+
+See the [Plugin Development Guide](../../development/plugin-guide.md) for detailed guidance.