New installer options (v2)

[aarondill]

This is a rewrite of #590 to reduce the diff and make it a more reasonable pr.

Add support for options in install script

This adds support for serveral new command line options (taken from the usage):

• -b, --bin-dir Override the bin installation directory
• -m, --man-dir Override the man installation directory
• -a, --arch Override the architecture identified by the installer
• -h, --help Display this help message This also (coincidentally) allows for $BIN_DIR, $MAN_DIR, and $ARCH to be set to create default settings for these. These variables are always overwritten by the command line arguments.

[aarondill]

@ajeetdsouza I hope I've accomplished what you expected when we first discussed this (almost a year ago) here. If anything is missing, or you have any changes you'd like made, please let me know :smile:

[rseichter]

I used the official install script for the first time today, because of the outdated Debian 11 package. Right away I was surprised by the hard-coded $HOME/.local/{bin,man} directories. While this was easy enough to fix manually, I would appreciate being able to pass the desired directories (or in my case a directory prefix /usr/local) as either a installer script argument or environment variable. I checked the list of Zoxide pull requests and found this one, so I'd like to vote in favour.

[rseichter]

Thank you for the new configuration options. They make automation easier for me, and I have already updated my jobs accordingly.

[ajeetdsouza]

Thank you @aarondill for the PR.