Improve Telegram formatting and web synthesis

deploy/README.md

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+# Marvin deployment (systemd)
+
+This project is intended to run as a systemd service using polling, a `.env` file for configuration, and a dedicated unprivileged user.
+
+## Recommended setup
+
+- Create a dedicated user: `marvin`
+- Place the project at: `/home/marvin/marvin`
+- Store secrets in: `/home/marvin/marvin/.env`
+- Run the bot with systemd
+- View logs with:
+
+```bash
+journalctl -u marvin -f
+```
+
+## Service file
+
+Install the provided service file:
+
+```bash
+sudo cp deploy/marvin.service /etc/systemd/system/marvin.service
+sudo systemctl daemon-reload
+sudo systemctl enable --now marvin
+```
+
+## Notes
+
+- The bot uses Telegram polling (`getUpdates`), so only one instance should run at a time.
+- If another copy is running, you may see a Telegram 409 conflict.
+- Use `journalctl -u marvin -f` to follow logs live.