Rename "entrypoint" to "target" or "main_script_path"

[whitphx]

Streamlit core uses these terms.

• "target": https://github.com/streamlit/streamlit/blob/619d9e48e878e77294f775413c28014140e81ce3/lib/streamlit/web/cli.py#L197
• "main_script_path": https://github.com/streamlit/streamlit/blob/619d9e48e878e77294f775413c28014140e81ce3/lib/streamlit/runtime/runtime.py#L197