Update live site URL to context-lab.com

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jeremymanning

README.md

@@ -2,7 +2,7 @@
 
 The official website for the Contextual Dynamics Lab at Dartmouth College, hosted on GitHub Pages.
 
-**Live site:** [https://contextlab.github.io](https://contextlab.github.io)
+**Live site:** [https://context-lab.com](https://context-lab.com)
 
 ## Site Structure