Update README with Ars write-up link

Author: lee

README.md

@@ -4,7 +4,7 @@
 
 _This document is LLM-generated._
 
-An always-on digital bedroom clock: a Raspberry Pi Zero W (or Zero 2 W) driving an Adafruit 1.2"
+An always-on digital bedroom clock, as written about on [Ars Technica](https://arstechnica.com/gadgets/2026/07/i-wanted-a-clock-that-never-needed-setting-things-escalated/): a Raspberry Pi Zero W (or Zero 2 W) driving an Adafruit 1.2"
 4-digit 7-segment display (HT16K33) over I2C. It shows 24-hour local time, keeps itself
 accurate over NTP, and follows daylight-saving transitions automatically — so it never
 needs to be reset.