remove streamlit-analytics form requirement.txt

test remove tracking

update st.beta_expander, st.beta_container to st.expander and st.container

update st.beta_columns to st.columns

Update main_app.py

Update main_app.py

Update main_app.py

Update main_app.py

Update main_app.py

Update main_app.py

debug

debug

add secret analytics credentials

fix a bug in the chi-squared test section

Update README.md