docs: Update docs

Author: iusztinpaul

README.md

@@ -103,7 +103,7 @@ Our recommendation for getting the most out of this course:
 
 | Module | Materials | Description | Running the code |
 |--------|-------|-------------|----------------|
-| 1 | [Build your Second Brain AI assistant](...) | Architect an AI assistant for your Second Brain. | **No code** |
+| 1 | [Build your Second Brain AI assistant](https://decodingml.substack.com/p/build-your-second-brain-ai-assistant) | Architect an AI assistant for your Second Brain. | **No code** |
 | 2 | Data pipelines for building AI assistants (WIP) | Build a data pipeline to process Notion data, crawl new documents, compute a quality score using LLMs and ingest them to a NoSQL database. | - |
 | 3 | Generate high-quality fine-tuning datasets (WIP) | Generate a high-quality summarization instruct dataset using distilation. | - |
 | 4 | Fine-tune and deploy open-source LLMs (WIP) | Fine-tune an open-source LLM to specialize it in summarizing documents and deploy it as a real-time endpoint. | - |