vim: update vimrc config

enable arrow keys
disable show 80 border cols

Signed-off-by: Kaspter Ju <nigh0st3018@gmail.com>
git: alias 'git br' ==> 'git branch -a'

Signed-off-by: Kaspter Ju <nigh0st3018@gmail.com>
vim: add empty dir for vim backup or swap

Signed-off-by: Kaspter Ju <nigh0st3018@gmail.com>