initial_setup: Add additional packages

Add packages vim, vlc & i3.
Also sort packages in alphabetical order.
initial_setup: Make installation less noisy

Increase the quiet level of apt-get install using -qq (which
automatically implies -y). But this is still not sufficient as what I
want is complete silence. Hence also redirect stdout & stderr to
/dev/null.
initial_setup: Clone into proper directory

The play directory was created, but things were not properly cloned into
it earlier.
initial_setup: Make the i3 directory if not there
vim plugin startify: Fix paths
vim plugin startify: Remove work related path