remove vim-plug dependency

install.zsh

@@ -38,13 +38,6 @@ done
 
 mkdir -p "$HOME/.vim/undo"
 
-# install vim-plug
-if [ ! -f "$HOME/.vim/autoload/plug.vim" ]; then
-  curl -fLo "$HOME/.vim/autoload/plug.vim" --create-dirs \
-    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
-  echo "vim-plug: installed"
-fi
-
 # install font
 fonturl="https://git.syui.ai/ai/font/raw/branch/main/aifont.ttf"
 fontpath="/usr/share/fonts/TTF/aifont.ttf"