[feat]: option to use zinit without changing `$PATH`

[seivan]

Feature request

I got zinit_downloads/polaris/bin in my $PATH, I have no idea how it got added there, and how to opt out of it.

Maybe related #154

[vladdoster]

@seivan Have you tried sbins?

What is your config?

[vladdoster]

This is also documented in the documentation

There is also $ZPFX, set by default to ~/.local/share/zinit/polaris – a directory where software with Makefile, etc., can be pointed to, by e.g. clone./configure --prefix=$ZPFX'.