Packages hosted anywhere other than GitHub lack readmes

[timwoj]

Our updater script that fills in the data from the individual package repos only grabs the README data if the package repo is hosted on Github. For an example, see the shodan-zeek package, which is hosted on Gitlab at https://gitlab.com/shodan-public/shodan-zeek. We don't load a README for that package, even though one exists in the repo.