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/configuration.md

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+# Configuration
+
+## Global Config
+
+Located at `~/.mempalace/config.json`:
+
+```json
+{
+  "palace_path": "/custom/path/to/palace",
+  "collection_name": "mempalace_drawers",
+  "people_map": {"Kai": "KAI", "Priya": "PRI"}
+}
+```
+
+| Key | Default | Description |
+|-----|---------|-------------|
+| `palace_path` | `~/.mempalace/palace` | Where ChromaDB stores your drawers |
+| `collection_name` | `mempalace_drawers` | ChromaDB collection name |
+| `people_map` | `{}` | Entity name → AAAK code mappings |
+
+## Project Config
+
+Generated by `mempalace init` in your project directory:
+
+### `mempalace.yaml`
+
+```yaml
+wing: myproject
+rooms:
+  - backend
+  - frontend
+  - decisions
+palace_path: ~/.mempalace/palace
+```
+
+### `entities.json`
+
+```json
+{
+  "Kai": "KAI",
+  "Priya": "PRI"
+}
+```
+
+Wings are auto-detected during `mempalace init` from:
+- Directory names → project wings
+- Detected people in file content → person wings
+- Explicit `--wing` flag on mine commands
+
+## Identity
+
+Located at `~/.mempalace/identity.txt`. Plain text. Becomes Layer 0 — loaded every session.
+
+```text
+I am Atlas, a personal AI assistant for Alice.
+Traits: warm, direct, remembers everything.
+People: Alice (creator), Bob (Alice's partner).
+Project: A journaling app that helps people process emotions.
+```
+
+::: tip
+Write your identity file in first person from the AI's perspective. This becomes the AI's self-concept on wake-up.
+:::
+
+## Palace Path Override
+
+All commands accept `--palace <path>` to override the default location:
+
+```bash
+mempalace search "query" --palace /tmp/test-palace
+mempalace mine ~/data/ --palace /tmp/test-palace
+```
+
+The MCP server also accepts `--palace`:
+
+```bash
+python -m mempalace.mcp_server --palace /custom/palace
+```
+
+## Environment Variables
+
+| Variable | Description |
+|----------|-------------|
+| `MEMPALACE_PALACE_PATH` | Override palace path (same as `--palace`) |
+| `MEMPAL_DIR` | Directory for auto-mining in hooks |