[+]: always use tmux

INFO:
use C-j and them "-" for h-split the screen
use C-j and then "|" for v-split the screen
use C-j and "Up, Down, Right, Left" for switching to a split-view
use C-j and C-o to rotate the split-view
use C-j and x to close the current split-view
[+]: always use tmux v2