fix/examples updated README and requirements

[zilto]

Address a user's bug submission

I’ve been working through the hamilton_ui example (https://github.com/DAGWorks-Inc/hamilton/tree/main/examples/hamilton_ui), and a a minor error popped up (I wouldn’t even call it that). When running the example, the python run.py bit, it gave a ValueError: The 'dtype_backend' argument is not supported for the fastparquet engine error. I fixed this by installing pyarrow, which is not currently listed in the requirements.txt file.
Second, the REAMDE.MD file is a bit outdated.
Current:
python run.py --email --project_id <project_id>
should be
python run.py --username --project_id <project_id>
and
python run.py --email --project_id <project_id> --load-from-parquet True
should be
python run.py --username --project_id <project_id> --load-from-parquet
without the True flag.

[elijahbenizzy]

👍