feat: add documentation website with Docusaurus build pipeline (#1177)

* feat: add documentation website with Docusaurus build pipeline

* feat(docs): add AI discovery meta tags for llms.txt files

- Add global headTags with ai-terms, llms, llms-full meta tags
- Update landing page link to clarify AI context purpose

* fix(docs): restore accidentally deleted faq.md and glossary.md

Files were removed in 12dd97fe during path restructuring.

* fix(docs): update broken project-readme links to GitHub URL

* feat(schema): add compound trigger format validation

docs/getting-started/installation.md

@@ -0,0 +1,76 @@
+# Installation
+
+Get BMAD Method running in your project in under 2 minutes.
+
+## Quick Install
+
+```bash
+npx bmad-method@alpha install
+```
+
+This interactive installer will:
+
+1. Detect your IDE (Claude Code, Cursor, VS Code, etc.)
+2. Let you choose which modules to install
+3. Configure agents and workflows for your project
+
+## Requirements
+
+- **Node.js** 18+ (for the installer)
+- **Git** (recommended for version control)
+- An **AI-powered IDE** or access to Claude/ChatGPT/Gemini
+
+## Module Options
+
+During installation, you'll choose which modules to install:
+
+| Module   | Description      | Best For                                 |
+| -------- | ---------------- | ---------------------------------------- |
+| **BMM**  | BMAD Method Core | Software development projects            |
+| **BMGD** | Game Development | Game projects with specialized workflows |
+| **BMB**  | Builder          | Creating custom agents and workflows     |
+
+## Post-Installation
+
+After installation, your project will have:
+
+```
+your-project/
+├── _bmad/              # BMAD configuration and agents
+│   ├── bmm/            # Method module (if installed)
+│   ├── bmgd/           # Game dev module (if installed)
+│   └── config.yaml     # Your project configuration
+├── .claude/            # IDE-specific setup (varies by IDE)
+└── ... your code
+```
+
+## Next Steps
+
+1. **Read the [Quick Start Guide](../modules/bmm/quick-start.md)** to build your first feature
+2. **Check your [IDE Guide](../ide-info/index.md)** for IDE-specific tips
+3. **Explore [Workflows](../modules/bmm/workflows-planning.md)** to understand the methodology
+
+## Alternative: Web Bundles
+
+Don't want to install? Use BMAD agents directly in:
+
+- **Claude Projects** - Upload the web bundle
+- **ChatGPT** - Use custom GPT bundles
+- **Gemini** - Import agent prompts
+
+See the [Web Bundles Guide](../web-bundles-gemini-gpt-guide.md) for details.
+
+## Troubleshooting
+
+### Common Issues
+
+**"Command not found: npx"**
+: Install Node.js 18+ from [nodejs.org](https://nodejs.org)
+
+**"Permission denied"**
+: Run with appropriate permissions or check your npm configuration
+
+**IDE not detected**
+: The installer will prompt you to select your IDE manually
+
+For more help, see [Troubleshooting](../modules/bmm/troubleshooting.md) or join our [Discord](https://discord.gg/bmad).