zsh plugins: use omz-compatible paths

The `programs.zsh.ohMyZsh.customPkgs` option expects that arguments
passed to it will have a zsh plugin/theme/completion in a path like
`$out/share/zsh/{plugins,themes,completions}`, and copies whatever is
inside those to `$ZSH_CUSTOM`.

However, some packages actually unpacked to `$out/share`, without the
proper folder structure, so they never got copied to `$ZSH_CUSTOM` and
caused "not found" errors on zsh startup.

This commit fixes that, and maintains compatibility with other packages
that might still expect a flattened structure. This is done though a
symlink.

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