Added typegpt2 model in knowledgebase

utils/config.py

@@ -131,7 +131,7 @@ class Config:
         
         # Model configuration
         self.models = ModelConfig(
-            mistral_model=os.getenv("MISTRAL_MODEL", ModelConfig.tinygpt2_model),
+            tinygpt2_model=os.getenv("MISTRAL_MODEL", ModelConfig.tinygpt2_model),
             embedding_model=os.getenv("EMBEDDING_MODEL", ModelConfig.embedding_model),
             whisper_model=os.getenv("WHISPER_MODEL", ModelConfig.whisper_model),
             temperature=float(os.getenv("TEMPERATURE", "0.7")),