Update README.md: remove architecture image reference

Author: htahir1

oncoclear/README.md

@@ -20,12 +20,6 @@ OncoClear is an end-to-end MLOps solution that transforms raw diagnostic measure
 - **Batch Inference Pipeline**: Run predictions on new data with production models
 - **Local API Deployment**: Serve models through a FastAPI endpoint
 
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-    <img alt="OncoClear Architecture" src=".assets/architecture_diagram.png" width="40%">
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 ## 💡 How It Works
 
 The OncoClear project consists of four integrated pipelines: