Update README.md

Author: iusztinpaul

apps/second-brain-online/README.md

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       <a href="https://decodingml.substack.com/" aria-label="Decoding ML">
-        <img src="../../static/dml_logo.png" alt="Decoding ML Logo" width="150"/>
+        <img src="https://github.com/user-attachments/assets/f2f2f9c0-54b7-4ae3-bf8d-23a359c86982" alt="Decoding ML Logo" width="150"/>
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         <h2>📬 Stay Updated</h2>
-        <p><b><a href="https://decodingml.substack.com/">Join Decoding ML</a></b> for proven content on production-grade AI, GenAI, and information retrieval systems. Every week, straight to your inbox.</p>
+        <p><b><a href="https://decodingml.substack.com/">Join Decoding ML</a></b> for proven content on designing, coding, and deploying production-grade AI systems with software engineering and MLOps best practices to help you ship AI applications. Every week, straight to your inbox.</p>
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