moves stuff around so its not a disaster in the root

configs/zsh/ohmyzsh/plugins/rustup/README.md

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+# rustup
+
+This plugin adds completion for [`rustup`](https://rustup.rs/), the toolchain installer for the Rust programming language.
+
+To use it, add `rustup` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... rustup)
+```

configs/zsh/ohmyzsh/plugins/rustup/rustup.plugin.zsh

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+if (( $+commands[rustup] )); then
+  # remove old generated completion file
+  command rm -f "${0:A:h}/_rustup"
+
+  ver="$(rustup --version 2>/dev/null)"
+  ver_file="$ZSH_CACHE_DIR/rustup_version"
+  comp_file="$ZSH_CACHE_DIR/completions/_rustup"
+
+  mkdir -p "${comp_file:h}"
+  (( ${fpath[(Ie)${comp_file:h}]} )) || fpath=("${comp_file:h}" $fpath)
+
+  if [[ ! -f "$comp_file" || ! -f "$ver_file" || "$ver" != "$(< "$ver_file")" ]]; then
+    rustup completions zsh >| "$comp_file"
+    echo "$ver" >| "$ver_file"
+  fi
+
+  declare -A _comps
+  autoload -Uz _rustup
+  _comps[rustup]=_rustup
+
+  unset ver ver_file comp_file
+fi