Pi-Hole Bash Welcome Tweak

I took the bash welcome tweak created by the retropie guys and did all the modification to make it a standalone item with an install/uninstall. Some people may find it useful if you log into the cli of your pihole in the event that your machine is doing double duty (Mine is a pihole/PBX in my house). All credit for the original GNU code goes to the retropie guys and I have left their licensing information at the top of the script.