Official source code can be found on one place

Written for command-not-found by Dominique Ramaekers on 2016-12-24

Up until today, people could find two sets of source code on launchpad. The official one on https://launchpad.net/~ubuntu-core-dev/command-not-found/ubuntu and the set on this project page. To avoid confusion, the source code of this project page is now linked to the official ubuntu-core-dev source code.