Remove zgen, since we moved to zinit

Author: bailey-coding

.gitmodules

@@ -4,9 +4,6 @@
 [submodule "vim/pack/tpope/start/sensible"]
 	path = vim/pack/local/start/sensible
 	url = https://tpope.io/vim/sensible.git
-[submodule "zsh/zgen"]
-	path = zsh/zgen
-	url = https://github.com/tarjoilija/zgen.git
 [submodule "vim/pack/local/start/editorconfig-vim"]
 	path = vim/pack/local/start/editorconfig-vim
 	url = https://github.com/editorconfig/editorconfig-vim.git