Help: `./install.sh` can be simpler

[gaojunran]

You can use one single command cargo install --path . to install the executable. By default, this command will build --release and move the executable to a folder that is in PATH.

By the way, I'm about to integrate the ability of downloading file/foldere into my hj project, thank you for your idea!

[winterrdog]

great! thanks for this suggestion @gaojunran

you can send in a PR if you don't mind 🤝