turn into a small pypi package

[HP2706]

i have turned your code into a simple pypi package. Most of the functions are conceptually the same, so i think you deserve the credit.

key changes:
just using asyncio.

how much faster?
for scraping "https://github.com/nomic-ai/nomic/tree/main"
your notebook: 27 seconds
the new solution: 3.8 seconds (with concurrent request limit at 100