Update npm and pypi installation commands in README docs

[gnpaone]

No description provided.

[casey]

Looks good! But why the change from pip to pipx? Honestly I always forget the difference and I'm not sure why I used pipx in the first place.

[gnpaone]

It works with pip, pipx, rye, poetry, uv etc. pip is python inbuilt/default package installer, pipx needs to be installed first separately before using pipx cli commands I guess. For beginners to keep it simple I changed it to pip 🙂. pipx is fine too if you want to retain it

[casey]

I think I used pipx because on MacOS with Homebrew, pip doesn't work, and it's a common configuration. I changed it back to pipx. Otherwise looks good!

[gnpaone]

Okay 🙂