Remove oh-my-zsh and related submodules

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "shell/zsh/oh-my-zsh"]
-	path = shell/zsh/oh-my-zsh
-	url = https://github.com/robbyrussell/oh-my-zsh.git
 [submodule "emacs.d"]
 	path = emacs.d
 	url = git@github.com:jimeh/.emacs.d.git
@@ -10,18 +7,12 @@
 [submodule "shell/tmux/tmuxifier"]
 	path = shell/tmux/tmuxifier
 	url = git@github.com:jimeh/tmuxifier.git
-[submodule "shell/zsh/zsh-syntax-highlighting"]
-	path = shell/zsh/custom/plugins/zsh-syntax-highlighting
-	url = git://github.com/zsh-users/zsh-syntax-highlighting.git
 [submodule "shell/bash/git-aware-prompt"]
 	path = shell/bash/git-aware-prompt
 	url = git@github.com:jimeh/git-aware-prompt.git
 [submodule "tmux/themes"]
 	path = tmux/themes
 	url = git@github.com:jimeh/tmux-themepack.git
-[submodule "shell/zsh/zsh-autosuggestions"]
-	path = shell/zsh/custom/plugins/zsh-autosuggestions
-	url = git@github.com:tarruda/zsh-autosuggestions.git
 [submodule "shell/enhancd"]
 	path = shell/enhancd
 	url = https://github.com/b4b4r07/enhancd