nix-zsh-completions: install nix.plugin.zsh and init.zsh as well
nix-zsh-completions: install nix.plugin.zsh and init.zsh as well

These files feature simple aliases and a nix-shell detector when using
`nix-shell --run zsh`. The package itself contains the completion scripts in
`$out/share/zsh/site-functions` (to keep it compatible with ZSH-only
setups) and the plugins in `$out/share/zsh/plugins` for oh-my-zsh.

NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs