Add sudo

[realmarkoprifti]

Added sudo for every privileged operation needed when running make install. This is supposed to make the installation of libcs50 go buttery-smooth for people who want to try solving C-related psets on their local machines

[standenboy]

Users can just run sudo make install which would have the same effect

This would also break the project for anyone who uses doas (or people who still login as root to install programs)