update folderstructure to match xdg-ninja

zsh/.local/share/oh-my-zsh/.oh-my-zsh/plugins/gh/README.md

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+# GitHub CLI plugin
+
+This plugin adds completion for the [GitHub CLI](https://cli.github.com/).
+
+To use it, add `gh` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... gh)
+```
+
+This plugin does not add any aliases.
+
+## Cache
+
+This plugin caches the completion script and is automatically updated when the
+plugin is loaded, which is usually when you start up a new terminal emulator.
+
+The cache is stored at:
+
+- `$ZSH/plugins/gh/_gh` completions script
+
+- `$ZSH_CACHE_DIR/gh_version` version of GitHub CLI, used to invalidate
+  the cache.

zsh/.local/share/oh-my-zsh/.oh-my-zsh/plugins/gh/gh.plugin.zsh

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+# Autocompletion for the GitHub CLI (gh).
+if (( ! $+commands[gh] )); then
+  return
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `gh`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_gh" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _gh
+  _comps[gh]=_gh
+fi
+
+gh completion --shell zsh >| "$ZSH_CACHE_DIR/completions/_gh" &|