Add shortcuts to dotfiles and scripts folders

Signed-off-by: Mario Steinhoff <mario.steinhoff@catapullt.de>
Add bash aliases ncat, ff, tower

ncat: cat with line numbers
ff: Open a Finder.app window in the current folder
tower: Open the Tower.app status tab in the current folder
Signed-off-by: Mario Steinhoff <mario.steinhoff@catapullt.de>