Clone the project first:
$ git clone git@github.com:XadillaX/_vimrc.git
Install dein.vim.
$ curl https://raw.githubusercontent.com/Shougo/dein.vim/master/bin/installer.sh > installer.sh
$ sh ./installer.sh ~/.cache/dein
$ rm installer.sh
Open Neovim and run:
:call dein#clear_state()
:call dein#install()
Enjoy!