Update doc site

Author: RajeshThallam

docs/mkdocs.yml

@@ -200,7 +200,6 @@ nav:
           - Interactive Spatial Reasoning: genai-on-vertex-ai/gemini/prompting_recipes/spatial_reasoning/spatial_reasoning_app_for_gemini2.ipynb   
         - Model Upgrades:
           - Overview: genai-on-vertex-ai/gemini/model_upgrades/README.md
-          - Text Classification: genai-on-vertex-ai/gemini/model_upgrades/text_classification/README.md
 
     - Evaluation: 
       - Overview: genai-on-vertex-ai/gemini/README.md