feat(vim/vimrc): add `vim-node` plugin and its settings
feat(vim/vimrc): add `vim-node` plugin and its settings

`<C-w>f`/`<C-w><C-f>` opens a target file in a vertical split instead of
opening it in a horizontal split.

The vim-plug's on-demand loading to detect the JavaScript filetype
somehow did not work for this plugin.

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles