Remove submodule _oh-my-fish
Squashed '_oh-my-fish/' content from commit 31acec1

git-subtree-dir: _oh-my-fish
git-subtree-split: 31acec117eb812bc6d48a4ce5dc5312a7ff48c9c
Merge commit '538c212cabb416912343178f862566ec7f9aa38b' as '_oh-my-fish'