feat: update embedding model and add empty directories for chat history and vector store

app.py

@@ -101,7 +101,8 @@ def init_models():
         api_key=GROQ_API_KEY
     )
     embeddings = HuggingFaceEmbeddings(
-        model_name="intfloat/multilingual-e5-large-instruct"
+        #model_name="intfloat/multilingual-e5-large-instruct"
+        model_name="sentence-transformers/all-MiniLM-L6-v2"
     )
     return llm, embeddings