HUGGINGFACEHUB_API_TOKEN={your-hf-token} QUESTION_ANSWERING_MODEL_ID={hf-question-answering-model-ID} EMBEDDING_MODEL_ID={hf-embedding-model-ID} INDEX_NAME=index USE_DOCS_FOR_CONTEXT=True ADD_SOURCES_TO_RESPONSE=True USE_MESSAGES_IN_CONTEXT=True NUM_RELEVANT_DOCS=3 DEBUG=True