docs: add VitePress documentation site

- 22 content pages across Guide, Concepts, and Reference sections
- Custom indigo/cyan theme with Lucide icons and Mermaid diagrams
- GitHub Actions workflow for GitHub Pages deployment
- Live preview: https://mempalace-docs.netlify.app/

website/guide/claude-code.md

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+# Claude Code Plugin
+
+The recommended way to use MemPalace with Claude Code — native marketplace install.
+
+## Installation
+
+```bash
+claude plugin marketplace add milla-jovovich/mempalace
+claude plugin install --scope user mempalace
+```
+
+Restart Claude Code, then type `/skills` to verify "mempalace" appears.
+
+## How It Works
+
+With the plugin installed, Claude Code automatically:
+- Starts the MemPalace MCP server on launch
+- Has access to all 19 tools
+- Learns the AAAK dialect and memory protocol from the `mempalace_status` response
+- Searches the palace before answering questions about past work
+
+No manual configuration needed. Just ask:
+
+> *"What did we decide about auth last month?"*
+
+## Alternative: Manual MCP
+
+If you prefer manual setup over the marketplace plugin:
+
+```bash
+claude mcp add mempalace -- python -m mempalace.mcp_server
+```
+
+Both approaches give identical functionality. The plugin approach handles server lifecycle automatically.
+
+## Hooks
+
+Set up [auto-save hooks](/guide/hooks) to ensure memories are saved automatically during long conversations.