temporarily remove 'try on colab' from the homepage

Colab updates seem to have broken compilation, and we are unable to get logs to fix it until we port to jitify2?

Author: ptheywood

index.md

@@ -10,8 +10,8 @@ header:
       url: "https://github.com/FLAMEGPU/FLAMEGPU2/"
     - label: "Docs"
       url: "https://docs.flamegpu.com"
-    - label: "Try on Colab"
-      url: "https://colab.research.google.com/github/FLAMEGPU/FLAMEGPU2-tutorial-python/blob/google-colab/FLAME_GPU_2_python_tutorial.ipynb"
+    # - label: "Try on Colab"
+      # url: "https://colab.research.google.com/github/FLAMEGPU/FLAMEGPU2-tutorial-python/blob/google-colab/FLAME_GPU_2_python_tutorial.ipynb"
 excerpt: "The Flexible Large-scale Agent Modelling Environment for the Graphics Processing Unit (GPU)"
 feature_row:
   - image_path: /assets/images/gpu_birds_square.png