chore: add a link to the Tailscale website

Author: minhuw

README.md

@@ -2,7 +2,7 @@
 
 > **LLM Usage Notice:** This project was designed by [@minhuw](https://github.com/minhuw) and implemented **entirely** by [Claude Code](https://claude.ai/code). Use at your own discretion.
 
-> **Security Notice:** Recommended for deployment on private networks (e.g., Tailscale) to prevent unauthorized access. This project does not implement robust security defenses.
+> **Security Notice:** Recommended for deployment on private networks (e.g., [Tailscale](https://tailscale.com/)) to prevent unauthorized access. This project does not implement robust security defenses.
 
 A lightweight macOS menubar app that lets you trigger text-to-speech notifications from any remote machine to alert the poor guy sitting in front of it.