Disable ProtGPT2

The space crashed.

hexviz/app.py

@@ -15,7 +15,7 @@ Pick a PDB ID, layer and head to visualize attention.
 
 # Define list of model types
 models = [
-    Model(name=ModelType.ProtGPT2, layers=36, heads=20),
+    # Model(name=ModelType.ProtGPT2, layers=36, heads=20),
     Model(name=ModelType.TAPE_BERT, layers=12, heads=12),
     Model(name=ModelType.ZymCTRL, layers=36, heads=16),
     # Model(name=ModelType.PROT_T5, layers=24, heads=32),