Add CLAUDE.md with project info and deployment instructions

CLAUDE.md

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+# mcMQTT
+
+MCP server for MQTT broker interaction and IoT messaging. Allows LLMs to publish, subscribe, and manage MQTT topics.
+
+- **Docs**: https://mcmqtt.warehack.ing
+- **Git**: `git@git.supported.systems:MCP/mcmqtt.git`
+- **Server**: `ssh -A warehack-ing@warehack.ing`, repo at `~/mcmqtt`
+
+## Docs Site Deployment
+
+Starlight documentation site in `docs-site/` subdirectory.
+
+### Environment
+
+Copy `.env.example` to `.env` in `docs-site/`:
+
+```env
+COMPOSE_PROJECT_NAME=mcmqtt-docs
+DOMAIN=mcmqtt.warehack.ing
+```
+
+### Commands
+
+```bash
+# From docs-site/ directory:
+make up        # Build and start production container
+make down      # Stop container
+make logs      # Tail container logs
+make restart   # Stop + start
+```
+
+### Deploy to Production
+
+```bash
+ssh -A warehack-ing@warehack.ing "cd ~/mcmqtt && git pull && cd docs-site && make up"
+```