remove submodule oh-my-zh
Squashed 'oh-my-zsh/' content from commit a38af27

git-subtree-dir: oh-my-zsh
git-subtree-split: a38af27991d15d14ac4ca55c919bb694d7eafb7a
Merge commit 'da1c07ebb3c4f956b596aae7e79c66e664705fb9' as 'oh-my-zsh'
customize prelude