feat: add button to reset conversation

app.py

@@ -77,6 +77,12 @@ def on_click_callback():
             # insert_chat_history_articles(conn, history_id, llm_response["source_documents"])
 
 
+def clear_history():
+    st.session_state.history.clear()
+    st.session_state.token_count = 0
+    st.session_state.conversation.memory.clear()
+
+
 load_css()
 initialize_session_state()
 
@@ -119,6 +125,8 @@ with chat_column:
             on_click=on_click_callback,
         )
 
+    st.button("New conversation", on_click=clear_history)
+
     information_placeholder.caption(
         f"""
     Used {st.session_state.token_count} tokens \n