[how] Change the footer of Streamlit.

st_footer.py

import streamlit as st

copyright_year = 2022
copyright_name = "🥺"

#########################
# Insert your code here 
#########################

text_footer = f"""
        <style>
            footer {{visibility: hidden;}}
        </style>
        <p style="font-size: 0.8em;display:block;text-align:center;">&copy;{copyright_year} {copyright_name}</p>
        """
st.markdown(text_footer, unsafe_allow_html=True)