Add ability to hide the "Made by Streamlit" footer

[matthew-trava]

Problem

The inability to hide, edit or remove the made by streamlit at the bottom of the webapp produced.

Solution

The ability to alter or remove the made by streamlit footer text

MVP: The simple addition to be able to set the text to False.

Additional context

Came from https://discuss.streamlit.io/t/remove-made-with-streamlit-from-bottom-of-app/1370

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[tconkling]

Hey @matthew-trava, thanks for taking the time to file an issue! I've edited the title to make it easier to search for, and moved it to our internal board, for triaging.

[tconkling]

Related: #395

[dansbecker]

It's not a feature for the product itself, but for a user who finds this and wants a hacky way to hide the footer, we use

    hide_footer_style = """
    <style>
    .reportview-container .main footer {visibility: hidden;}    
    """
    st.markdown(hide_footer_style, unsafe_allow_html=True)