fix: set correct INSTALL_DIR for brew installation

[zeroberry]

fixes #824, #1190, #1194, #1237, #1279

On macOS, when you install fnm using Homebrew, the installation directory ends up being something like /usr/local/opt/fnm or /opt/homebrew/opt/fnm instead of $HOME/.fnm, $XDG_DATA_HOME/fnm, $HOME/Library/Application Support/fnm.

I updated INSTALL_DIR to match the correct location for Homebrew installations. Also, since Homebrew takes care of the PATH automatically, export PATH step is removed.

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Name	Status	Preview	Comments	Updated (UTC)
fnm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 8, 2025 3:13pm

[ericbdev]

<3 I've literally just sorted this out in my own system when the readme instructions didn't work.

[kaaax0815]

If you just install using brew install fnm (which the install script is doing) no additional config is required other then adding something like

eval "$(fnm env --use-on-cd --version-file-strategy=recursive)"

to your .zshrc

as brew automatically adds

eval "$(/opt/homebrew/bin/brew shellenv)"

to your .zprofile which adds /opt/homebrew/bin to your path. and by installing fnm, brew adds a symlink to the correct binary already