[zsh] Remove Nix stuff

We're using Lix[1] now instead.

[1]: https://lix.systems/

zsh/.zshenv

···
   export BROWSER="firefox"
 fi
 
-export NIX_REMOTE=daemon
-
 export BASE16_THEME="eighties"
 export CATPPUCCIN_THEME="macchiato"
-
-if [[ -z "$XDG_DATA_DIRS" ]]; then
-  export XDG_DATA_DIRS="/usr/local/share:/usr/share"
-fi
-
-nix_share="$HOME/.nix-profile/share:$XDG_DATA_DIRS"
-if [[ ":${XDG_DATA_DIRS}:" != *":${nix_share}:"* ]]; then
-  export XDG_DATA_DIRS="${nix_share}${XDG_DATA_DIRS:+:${XDG_DATA_DIRS}}"
-fi
 
 # WTF, Ansible?
 export ANSIBLE_NOCOWS=1

zsh/.zshrc

···
 typeset -aUx path
 fpath=($HOME/.zsh $HOME/.zfunc $fpath)
-path=($HOME/.local/bin "$HOME/.nix-profile/bin" "$HOME/.cargo/bin" "$path[@]")
+path=($HOME/.local/bin "$HOME/.cargo/bin" "$path[@]")
 path[$path[(i)/mnt/c/Ruby/bin]]=()
 export path