add arXiv paper

add project-page link (egomemreason.github.io)

update GitHub URL to Ziyang412/EgoMemReason

also patch _json_schema_to_python_type for bool schemas

make About the default landing tab

monkey-patch gradio_client.utils.get_type to handle bool schemas

tighten leaderboard: drop date col, shorten headers, no theme, no wrap

initial Space